The More You Know: Living With Astigmatism When Using Red Dot, Holographic and Prismatic Optics

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About 15 years ago I sadly boxed up a brand new Red Dot Optic for it’s return to the manufacturer without ever having used it to fire a shot – the reticle was a blurry burst rather than a crisp clear dot. But before I called and asked for a return authorization, I decided to search the Internet looking for answers on the durability of my new glass. And that’s when I found it: my new optic wasn’t the problem, I was.

As a test, there were two initial suggestions – look at the reticle while wearing polarized glasses or look at the reticle with the rear back up iron sight (BUIS) flipped up. Boom, the dot was nearly perfect. It appeared that I had an astigmatism – my eye or cornea was mis-shaped, distorting the red dot.

What is astigmatism?

From the American Optometric Association:

Astigmatism is a common vision condition that causes blurred vision. It occurs when the cornea (the clear front cover of the eye) is irregularly shaped or sometimes because of the curvature of the lens inside the eye.

An irregularly shaped cornea or lens prevents light from focusing properly on the retina, the light-sensitive surface at the back of the eye. As a result, vision becomes blurred at any distance. This can lead to eye discomfort and headaches.

 

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Red Dot Sights:

The reason an astigmatism is problematic for shooters who use red dot sights is because the dot is created with a collimating minating mirror. In a normal eye, those beams of light all have one focal point  However in an astigmatic eye, those beams of light are refracted into multiple multiple focal points. The result is a blurry, distorted or “bursting” dot.

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Wikipedia: Diagram of a typical “red dot” sight using a collimating mirror with a light-emitting diode at its focus that creates a virtual “dot” image at infinity.

Polarized glasses and the tiny hole in the BUIS help to sharpen the dot because both devices restrict the light rays entering your eye to only those that are both direct and parallel with the other light rays, eliminating reflections and some of the additional focal points.

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The original Aimpoint patent.

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The original Aimpoint patent.

 

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Aimpoint M68 Red Dot Optic

 

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Aimpoint RDS reticle.

Holographic Weapon Sights:

Working on similar principles but with slightly different mechanics, Holographic Weapon Sights (HWS) like those manufactured by EOTech, also project an illuminated reticle. One difference comes from the light bouncing off a “holographic grate” rather than into a single dot. For shooters with an astigmatism, HWS setups can appear to have less distortion than a RDS because the holographic grate can act similarly to a polarizing filer. However, HWS products are not completely astigmatic aberration-free.

 

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EOTech patent.

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EOTech HWS reticle.

Prismatic Optics:

Prismatic-based optics, on the other hand function more like traditional optics (like binoculars or rifle scopes), using lenses and etched glass to produce their reticles. Because of the lack of collimator or mirrors, most shooters with astigmatisms report less aberrations as compared to RDS or HWS systems. One side benefit is that since the reticle is etched in glass, rather than an image that is projected upon it, if a users batteries die or the electronics otherwise fail, most reticles revert to black.

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Trijicon ACOG patent.

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A Trijicon ACOG reticle.

Luckily, I scheduled an optometrist appointment before I sent my first RDS back for repair or replacement. Even luckier was that my doctor, who was a bombardier in the Vietnam War, also suffered from an astigmatism and had difficulties with viewing certain reticles in his bombsight. He was able to get me a proper prescription and suggest corrected sunglasses with polarized lenses.

So, you think you have an astigmatism, what now?

  1. Go to the optometrist and bring your sight with you. Explain to your doctor, or even draw, the reticle pattern you see when looking though your sight uncorrected.
  2. Get polarized, corrected sunglasses for daylight shooting.
  3. Try before you buy. Even with a proper prescription you may still have some distortion. Visit a dealer or find a friend who will let you use their sights.
  4. Maybe a RDS or HWS is not the right choice for you. There are several manufacturers of high-quality prismatic optics both with and without magnification.
  5. Try the rear BUIS trick. Can you live with that option?
  6. Focus on the target and not the dot.

Odd-shaped eyeballs, polarized sunglasses, reflection and refraction – And that’s ‘The More You Know’.

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Pete

LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Pete.M@staff.thefirearmblog.com


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  • MechanizedSwede

    Nice pic of an old Ak5D with an aimpoint CS sight

    • Pete – TFB Writer

      Sexy rifle.

  • BattleshipGrey

    Great article. I don’t currently own an RDS, but I’ll remember this article when I get one, or if I hear of friends having that issue.

  • I must have it as well, because my vision gets blurry when I look at the price tags on Eotechs and Aimpoints.

    • Gary Kirk

      Try an acog

      • Drew Coleman

        So worth it though…

        • Gary Kirk

          Yep, love mine

    • Pete – TFB Writer

      That’s a different condition all together. The scientific name is ‘Gun Fundus Depletus’. It effects 98% of all firearms owners at one point or another. Tragic.

      • Major Tom

        That’s not contagious is it?

        • Pete – TFB Writer

          Transmission rates are logarithmic. Sad.

        • Tassiebush

          No the contagious one is gun fungus excretus which is totally why I can’t loan my guns to people :-p

        • Peadair

          Not meaning to step on Tassiebush’s toes, but it can be, especially if you invite friends who have never shot before, to shoot with you, and go to the bar afterwards. It is a socially transmitted disease.

        • WhoHasMyChange

          I got it from my wife. Seems some women are carriers, showing no signs of it but they spread it to their spouse’s wallet.

      • Cory C

        Hahaha.

    • DwnRange

      Bet your vision would improve by checking out a new faux T1 copy by TruGlow……

      I been using one for several months now and have had no complaints regarding it at all, infact I like the auto on feature (but then I own a plethora of T1s, CompM4, ML2, M2s and EOs) – it holds zero, came with 1/3 co-witness mount and for around $120 I haven’t found any reason to diss it so far……

      • imtoomuch

        The TruGlow looks a lot like Holosun. I’m guessing Holsun is the OEM. So now Bushnell, Holoson, Primary Arms, and TruGlow are all on my radar.

        • jim

          Friends don’t let friends buy Chinese

    • Coyotehunter

      You think the price of the EOTech is high just wait until you talk to your Eye Doctor about the price of laser assisted cataract surgery. About $3000 for each eye in my area. But the laser corrected my astigmatism on both eyes while removing my bad lens and helping the eye doctor replace the old lens with new ones giving me 20/15 eye sight at distance. The problem is that the new lens can’t focus my eyes up close so I can’t see the sights on my pistol unless it’s about 3 yards out in front of my eyes on out to infinity. My EOTech EXPS3.4’s hologram reticle is much crisper now after the eye surgery. But like the article said I can see though my Nikon P223 Rifle Scope much better at the range than with my EOTech. Also the EOTech has problems with zero drift with increased or decreased temperatures. If you have an EOTech HWS it’s best to some times turn the light intensity down to make the little 1 MOA red dots crisper in the image. That includes all the tiny dots that make up the 65 MOA circle as well as the red dot in the middle of the circle. I have 4 red dots lined up in a vertical line with one dot on top of the other and so on and on. And sometimes when my eyes are tired the astigmatism comes back and I see two vertical rows of red dots.

  • Tassiebush

    Wow I’ve looked at a few red dot sights and always wondered why even the hallowed aimpoint seemed cr@p whilst a conventional scope seems fine. I do have this issue with my dominant eye and now it makes sense. This one is going on my bookmarks. T hanks Pete!

    • Pete – TFB Writer

      No problem. I’m right there with you.

      • Tassiebush

        It’s funny I seriously thought it was like hamburgers. The actual thing being much less neat than the picture.

        • Aramaki

          I got diagnosed with an astigmatism back in January. I got corrective lenses as I’m an engineer, and the tiniest bit of blurriness can give me headaches. It’s just shocking when I take my glasses off to see just how garbage my normal vision is. Highly recommend seeing an optometrist. If you have a Costco membership, it’s like $60 and you’ll walk out half an hour later with a prescription. While I didn’t like spending $200 on glasses, I’m glad I did.

          • Tassiebush

            Yeah it’s much better with glasses. I’ve got glasses but I’m Australian so the good one here is a business called spec savers. The assessment and prescription bit is govt funded through Medicare here so it’s free and that business will do two pairs of glasses for $200. I’m long sighted in my left and have the astigmatism in my right. Basically I was finding the computer at work a pain and realizing my vision wasn’t as clear as it once was. I actually have two prescriptions. One for reading and another for outdoor stuff which I use the most. I got a pair of reading glasses, sun glasses and normal glasses with anti glare coating but no tinting for low light conditions. The cool thing is it restored my sight a great deal. I really recommend people get checked out and get them even if it’s not a severe problem because the quality of life improvement has been substantial.

    • On a cheap burris microdot site copy, I got a magnifying glass and a sewing needle with paint to cover up portions of the tiny diode. This was before I knew I had astigmatism….

      • Tassiebush

        That’s a cool try at fixing it

  • thedonn007

    Are there any quality lower cost prismatic optics?

    • Pete – TFB Writer

      Vortex. Great company and products.

      • thedonn007

        Thanks, I am on the Vortex website now looking at the Spitfire. Trying to find the battery life.

        • Mack

          Pretty sure Primary and Sig have some lower cost prism optics also.

        • BillC

          You can find Vortex Optics cheaper than what the MSRP is on the Vortex website. Try places like Primary Arms or Optics Planet. The reason why many Vortex Optics are relatively cheap is that they are made in the Philippines, but generally have high QC and an outstanding warranty.

      • thedonn007

        It looks like Burris has a 1x prism optic as well. 5,000 hours battery life on an AA battery.

        • Pete – TFB Writer

          They do. Thanks. Another good company. Leupold has one too.

  • Major Tom

    My left eye has a case of keratoconus (a form of astigmatism) that sadly ended my Army career but my right eye has no such problems. Normally when I’m looking through optics or sights of any kind, I’m so right eye dominant that the left eye’s problems don’t factor in.

  • hking

    I had to give up on using red dots because of my astigmatism. Now I use optics like the Vortex Spitfire 1x (its actually 1.5x very slight magnification) on my Evo Carbine & 3gun rifle and a 1.5x Ta45 ACOG on my AR platform rifles, can use both just as effective as a red dot. Ideally I would use a TA45 for 3gun as well but I shoot a division with “no magnified optics” which limits it to pretty much red dots.

    • notalima

      Same here.

      Sadly, I have a handful of PROs, ML2s, and an ML3, along with two Eotechs. The Aimpoints are semi-usable, looking like comets, but the Eotechs are completely unusable for me anymore. Like a huge star pattern of blurs at every micro-dot.

      I’ve picked up a few Vortex Spitfires (1x) and have found those to be very usable with no visible blur. That said, I don’t have full confidence in the durability and reliability of the Spitfire, as compared to my Aimpoints.

      Also, a side point, when view though a 3X magnifier, the Aimpoint dot becomes a ‘dot’ again. I guess this works like looking at it through the peep sight, maybe?

      • Holdfast_II

        When I bought my first Eotech I thought it must have been defective. Then I took a digital picture of the reticle, and realized that I am defective.

        I never had a problem with my old issue C79 from Elcan, but I cannot seem to find one available for purchase down here.

    • VF 1777

      Me as well. Do sacrifice eye relief, weight and battery life with prismatics, but at least I’m not staring at a damn cluster of grapes or starburst anymore. I have a spitfire and ta45 1.5×24 too. One thing not covered in the article is that magnification also helps clear up the abberations. I love my leupie vxr 1.25 -4x. The firedot is actually a crisp dot. Thats also why abberations for me go away with a 3x magnifier, but i’m not a big fan because of weight, lousy eye relief and FOV on 3x mags. Anyway, i f*cking really wish someone would have posted this article years ago before i spent thousands of dollars on high end red dots figuring this all out after the fact. But thanks. Just a few years and a few thousand dollars late.

      • coyotehunter

        Yea the EOTech EXPS 3-4 reticle is more clear when I use the G-33 Magnifier in line with the optics and my eye. Maybe the magnifier helps see the tiny 1MOA red dots better. Years ago when I first noticed my eye’s going bad and found out that I had astigmatism problems I noticed that at night the Street Signs along the side of the highway were distorted. The red colored lights on the signs were worse than the Green or Blue colored lights. So I noticed that the color of the light and the different wave lengths made a difference in my vision at night. Red wave lengths being longer than the Blue Wave Lengths.

    • mig1nc

      Me too. I recently switched from Aimpoint to Trijicon 1.5x16S short housing compact ACOG. So far, I’m pretty happy with the switch.

  • Pete – TFB Writer

    For those interested, The Trijicon MRO shows less distortion with astigmatisms. I run a Trijicon Accupoint, Vortex and the Lucid L7 I’m testing looks great too.

    • Evan

      Thanks Pete! As a sufferer myself I’ve been scouring the Internet for years looking for astigmatism-specific reviews of red dots, and as I’m sure you’re well aware info of that variety is SCARCE. You’d think at least one of the aging gun writers out there would have it and make mention of it once in a while…

      • Pete – TFB Writer

        In their defense, all astigmatisms are slightly different. The optic that looks terrible to me may look ok to you. But, I agree, it should be discussed a bit more. Almost like an “Astigmatism Effect Scale” on optics packaging.

        • coyotehunter

          Also the color of the dots or reticles can make a difference in how bad your astigmatism will appear when looking though optics. Wave lengths of different light colors vary . Blue being shorter than red.

    • uisconfruzed

      The MRO looked the same as my T2, the MRO looked to have a darker/bluer lens like my T1. I chose to go with the T2 for low light conditions.

  • Joe Moore

    Also, consider LASIK or PRK surgery, as they often solve or improve astigmatism issues. Very satisfied with having my procedure done.

    • ProLiberty82

      Yeah, save up $2.000 and upgrade your internal optics instead of spending that on rifle optics, a much more worthwhile investment!

      • tts

        Great post + AV pic combo +1

    • QuadGMoto

      It’s my understanding that one or more of those surgery types should not be done if you have presbyopia. (Old eyes) Anyone know the details on that?

      • Evan

        Yes that is the case. My mother and I are both astigmatism sufferers, and the doctors told her that it would make virtually no difference at her age (late 50s), and told her perhaps when she was 20 or so…
        There’s something about my condition, because I’ve brought it up, and the doc is fairly confident I’d still need glasses even after surgery was done (I’m 30).

        But this very issue is what has kept me from throwing down any money on a red dot.

    • Holdfast_II

      Unfortunately, LASIK often cannot correct all of one’s astigmatism. LASIK brought me to essentially 20/20 but I still have some astigmatism because it would have required cutting off too much material to correct it.

    • billyoblivion

      Yeah, unless you’re far sighted with a high correction, then no LASIK for you!

    • jay

      Except they don’t all way’s guarantee 20/20. I ended up with 20/50 (approx) after a second refresh. So I ended up still wearing glasses.

    • John

      I was near sighted with an astigmatism and had custom LASIK. Sight is better than 20/20. It can cause red dots to “star” in low light, but gets better as you heal. Perfect in daylight. My shooting is much improved in all conditions. YMMV

      Oh… And I use Aimpoints. The PRO is the way to go.

  • ProLiberty82

    With me Eotechs look like a distorted mess while with Aimpoints I have no problems, there is a little bit of flare with the Aimpoints at higher settings but not to the point it’s getting to be a problem. My friends don’t get bothered by the Eotechs so I might have some level of

    astigmatism.

    • QuadGMoto

      I found out I have a minor astigmatism in my dominant eye a few years ago. That explains why the Eotech I used to have looked like a cluster of tiny dots. (Or at least I assume that was the cause.) Every other sight type I’ve used has been fine.

    • uisconfruzed

      Same here, I sold my EO’s and have a of T-1 &2.
      I’ve also found the cheaper night vision exacerbates the flared dot and turns it into an oval.

    • coyotehunter

      It’s normal to have multiple dots with the EOTech if you have astigmatism problems. But the good news is that astigmatism can be fixed with contacts, glasses or with laser eye surgery. I had mine fixed with I had cataract surgery. it’s not cheap though. But my eye doctor (save firm but not a surgeon like the other one who did my operation) doesn’t shoot and didn’t understand my concerns about using a EOTech system at the gun range. I need to work on him some more before he retires. He found a problem with my retina that helped me go to the right surgeon and saved my eye sight in my left eye.

    • Jon Zaring

      Most red dots splatter for me but the aimpoint was so crisp that I invested the money into it. I just thought it was the difference between cheap and expensive optics; I had no idea the splatter was cheap optics and astigmatism.

  • Brought my RDS to optometrist two years ago. He wasn’t a hunter or shooter. (This was in West Virginia) Make sure your optometrist understands the concerns and recognizes that a little dot being a big blurry dot isn’t just a minor inconvenience that can be shrugged off.

    I was thoroughly dissatisfied and have now found a new optometrist ♡

    • Tassiebush

      Yeah it’s funny because they just don’t necessarily have a clue how important good vision is. I was told that I only needed reading glasses but might be on the way to needing regular ones but didn’t need them yet but I guess they probably use reading roadsigns or something as criteria. I knew I was having trouble spotting small game and fish (I spearfish and go prawning at night by flounder light) so I insisted I’d like to have them and it basically gave me teenager like vision in the field again.

      • Matt Wilder

        My optometrist for years before I moved to Florida was a lifelong hunter and shooter, and the day he learned I was too when I was 14, we were like best friends. I think we spent more time talking about shooting than eyes. I mentioned further up that I lack any real depth perception, and he was the first to recognize this. He basically taught me to be my own rangefinder, and gave me the best advice that has helped the most with my condition. He told me to memorize and get used to the general size of as many objects as I could, and then I’d be good to go, or at least better equipped. It worked for me in spades. Having an optometrist who understood was a huge help, especially when it came to the shooting and hunting sports. But, it was kind of odd finding him by chance, as he was located in the town I lived which was basically suburban NJ; you know, where firearms are only whispered about in dark alleys and back-joint bars.
        Now I’m a cheap bastard, and get my glasses at one of those two for $70 places, so none of them EVER seem to get some of my issues; luckily my time with my hunter doctor eye man gave me all I really needed to know anyhow.

        • Tassiebush

          He sounds like a fantastic mentor and friend!

  • IndyToddrick

    I just turn down the brightness to reduce flare on my Aimpoints. Eotechs were too hideous under nearly all circumstances by comparison. I don’t think as many people have astigmatisms as just too high of expectations.

    • Tassiebush

      I was looking at an aimpoint and found that turning it down did make it clearer eventually but by then it wasn’t exactly standing out so it wouldn’t have been quick to use.

  • imtoomuch

    The timing of this article couldn’t be more perfect. I bought my first AR-15 two weeks ago. I’m currently researching optics. I’ve been looking at red dots and then learned they might not be good for somebody that has an astigmatism which I have. Thanks for the article!

  • jay

    Simple, get prescription lenses that are polarized, or have polarized clip ons.

  • Joe

    I need to check out a holographic sight. It’s been about 20 years since I did and back then I had no problems, but I don’t remember if I was wearing glasses at the time. I did peek through an ACOG at JRTC 10 years ago, perfectly crisp, but again, glasses? Problem is I walked away from glasses 8 years ago. Today my Primary Arms reflex dot is a starburst, and if a simple 1x-ish optic is the answer, wonderful. I can’t guarantee corrective eyewear in a self-defense scenario.

  • Greek Preparedness

    what is the “rear BUIS trick”?

  • gabriel brack

    For anyone interested-merit optical attachment is $71.50 @ Dixie gun works. Peep sight that suctions onto your shooting glasses.

  • gabriel brack

    I have astigmatism and have found that green dots are easier to see for me but I can see red dots well enough that it never really made a difference. Eotechs have to be turned down real low to be useful.

  • james

    I love this. I have same problem. Yes buis tricks works. FYI I have a lucid hd7 for some reason the reticles are clear outside buy not inside. All variable 1-x scopes work after you focus diopter. Couldn’t get acog to work no diopter. Looking for long battery life now in a scope.

  • uisconfruzed

    I’ve old man eyes (I need a 2+ diopter), a slight astigmatism, AND floaters, joy!
    The EO-T delivered so much light that with floaters it washed out my target in low light, like oncoming traffic at night with light rain.
    I’ve fount the Aimpoint and ACOG work best for me, I wish the ACO had a lower power and price.

    • coyotehunter

      I had the floaters in my left eye sucked out of my eye ball and replaced with saline solution. My vision improved after retinal surgery to repair and remove an epiretinal membrane off my left eye retina. I had cataract surgery on the left eye as well as laser surgery to correct the shape of my left eye’s cornea to correct for the astigmatism. But the laser surgery was not 100% effective. My astigmatism can come back and go away if my eye’s get tired or get too dried out. Not sure why they do that. I guess the cornea can change shape again even after laser surgery to make it more spherical vs. shaped like the end of a football. Eyeballs that are shaped like a football instead of a basketball have more astigmatism problems.

      • uisconfruzed

        I ASKED if they could do anything about the floaters and I was told no, I’d absorb them. I was thinking eyeball dialysis would be awesome.
        Thanks! I’m going to talk to someone else.

  • Rick Kirkpatrick

    As mentioned in the article, my EoTech 517 looks just fine. My son’s Primary Arms AMD and the new TruGlo model, both apparently from the Holosun stable, give me a vertically oriented figure “8”, two dots touching. My cousin’s Aimpoint H1 gives me that same figure 8 but the two halves are separated. So, whenever I get a new red dot, I just sight in on the top dot. It’s working so far for me. Maybe my astigmatism isn’t as bad as others might be.

  • Norm Glitz

    There is one simple test for blurry optics. Rotate the optic device while holding your head in the same position. If the comet tail or bunch of grapes rotates with the device, then it’s a problem in the device itself. If the abberation stays the same, it’s you.

    Culmination = collimation?

    And light is reflected off a grating, it doesn’t pass through.

    • Pete – TFB Writer

      Thanks for the clarification, Norm. Much appreciated.

  • Marion

    Great article. This happened to me a few years ago. When I got a pair of prescription glasses and looked at the dot, it was normal. Now I just shoot with my prescription lenses on and have no problem.

  • josh

    this explains a lot, i always see a modified starburst as the dot, it really “bursts” to the 7 o’clock position… quite a bit, and the rest of the dot is like a hazy fuzzball. Its no problem for CQB (i did make it out of Iraq and Afghanistan after all) but when shooting at distance with the red dot it was always a minor problem. This is why i tend to go with 1-4 (or a 2-6 power or the like) power scopes with a lighted center point now, on 1 power its just as fast as a red dot and i can crank it up to 4 power for distance shots.

  • LetsTryLibertyAgain

    Thanks for a great and very informative article. Really top notch! I loved the “More You Know” logo at the bottom.

    I’m in my mid 50s and had already diagnosed myself as having astigmatism. A red LED point source of light in a dark room looks like a weird cluster of grapes pattern, and two LEDs look like the same pattern, so it’s me and not the LED. Also, when I rotate my head the pattern orientation matches my eye, and the other eye has a different but distinctive pattern that behaves the same way, so I have some sort of astigmatism in each eye. And it’s gotten a lot worse in the last month, and now I have a floater strand in my left eye. I finally got a 338 Lapua and a nice scope for some 1000+ yard shooting and now my eyes are going. Sux 2B old! Beats the alternative! I should stop buying rifles and scopes and go to the ophthalmologist. I should at least get some real glasses instead of $18 reading glasses at Walmart. Priorities!

  • Lyle

    Telling a customer that their brand new 700 dollar optic is fine, and that the problem is them, is not easy. Thanks for the backup.

  • C. Her

    I’m definitely in this “starburst” crowd. I was torn between buying an Aimpoint Micro VS Vortex’s Sparc II. Starburst looked identical and each unit is similar sized. I’m a big Vortex fan myself and I knew I could buy 5-6 Sparc II’s for one Aimpoint Micro. I eventually went with the Aimpoint for it’s shear awesomeness, ruggedness and because it’s an Aimpoint.

  • Matt Wilder

    Both my eyes are off so bad, I lack any sort of real discernible depth perception, and they say that since my body and eyes got so used to it without correction growing up till I started wearing glasses, that essentially my brain and vision cortex is locked into perceiving it that way, so I’m stuck. Not to say I have absolutely none, but it’s so little it may not even exist. I have a smidgeon more perception with glasses, but it doesn’t fix the issue. It’s kind of funny, because in grade school all of my gym teachers just thought I lacked coordination and was just clumsy, so no one ever picked up on the real reason. Well, over time, I’ve been able to train myself to recognize the size of objects and therefore their relation in space, so my coordination is actually quite good now if not better than some; as long as I know the size.. haha. Believe it or not, outside of shooting and other things, I fly RC aircraft without any problem and that’s all about coordination and dealing with distant objects at varying distances. It’s actually paid off long range shooting too, because my brain then instantly recognizes the distance to target if it’s a known size to me; kind of like built in range finding to a degree! However, if the size is unknown.. yeah, good luck. 3D movies are definitely a bust, but TV is fun because it’s pretty close to seeing in real life, so take that 3000 dollar 3d TVs!. As well, I wear corrective lenses for distance, so without them on my red-dots and other optics are fuzzy, but luckily with my glasses they’re fine and polarized lenses make it even better. Now, I always felt bad for my old man, because he just couldn’t use red dot or holo optics because of cataracts. He got his eyes worked on last year and is back in the fight, however any sort of artificial optic outside of regular scopes are pretty much a no-go for him because of light haloing. But oh boy can the man shoot in low light with just iron sights on his M4..it’s downright impressive to me.