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Ask HN: Do your eyes bug you even though your prescription is "correct"?

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Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#271

Post by dnh44 »

kps wrote: post #101
jasode wrote: post #71

The solution for me to eliminate headaches when working at computer screens was getting an extra set of intermediate distance glasses specifically for computer work. The "computer screen distance" of 3 ft is in between book-reading distance of 1 feet and driving distance 20'+ feet. I also avoid progressive lenses or high-index lenses for computer work. I commented about how arrived at this solution previously: https:…

> I also avoid […] high-index lenses for computer work. Yes! You're the first to mention this. It's not refractive index itself that's the problem, it's dispersion (roughly, the degree to which refractive index varies across the visual spectrum, described by ‘Abbe number’). We've all seen pictures of a prism splitting a beam of white light into a rainbow — for visual purposes, the less split the better. Higher-index…

You could also try Trivex instead of MR-8. Lens thickness should be similar but it has a higher ABBE value.

Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#274

Post by teslabox »

About four years ago I went to the Costco optometrist for a contact lens prescription. The O.D. said I was at the age where people start needing reading glasses, but I passed on those. It was the strongest prescription I'd ever had. After the appointment I put the contacts in the case and wore my weak glasses for the rest of the week. The day before the check appointment I put them back on my eyes - everything was crystal clear, but I couldn't read my phone.

The check appointment was with the practice's other O.D. I said the prescription would've been great for sniper shooting, but I just needed something to read the computer monitor. "You want an intermediate-range prescription." It was better, but still too strong. I used the curvature measurement to order my own prescription from one of the online contact stores. Three years later I upped my prescription by a quarter diopter.

Contact pro-tip: I use my contacts for 1.5 to 2x the rated time. Daily contacts can't be used for more than a day. 2 week contacts are good for at least 3 weeks. I've found my monthly contacts are good for at least 6 weeks. I've started using the hydrogen peroxide contact solutions: https://clearcaresolution.myalcon.com/

> even though your prescription is "correct"?

Most people have a range of prescriptions that they find acceptable. Some people's visual mechanism only 'likes' a specific prescription that might not correct them to 20/20. Developmental Optometry is a sub-specialty of optometry that considers more than acuity. This is a overview: https://www.theottoolbox.com/behavioral-optometrist-developm...

My contacts correct to 20/40 or 20/50, which are good enough for most tasks.

Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#275

Post by notnullorvoid »

I was told I have astigmatism by multiple optometrist, but I'm convinced they aren't right. I have clear double image (not blurring) in one eye shifted by ~1% or so down and to the left, no prescription has ever corrected it in the slightest (some have made it worse). These days I just live with it and don't wear glasses. I've contemplated getting eye surgery if I was confident that the issue would be corrected.

Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#276

Post by bentcorner »

I'm nearsighted, and I use reading glasses at my age, but when I was younger and used the same glasses everywhere, occasionally my left eye would just give up focusing and I'd have blurry vision for an hour or two. It'd be pretty disruptive to my work and I'd have to take a break. It'd occur a few times a year.

These days I still use screens a lot but I don't recall the last instance of this happening, and I think my reading glasses have largely solved this problem for me.

Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#277

Post by stevebmark »

I don’t know what your intentions or hypothesis are, but this is a dangerous place to be a novice in. Eye health is misunderstood and most people are ignorant of the basics. If you don’t know what emmetropization is, if you don’t know who Bates is, and if you don’t know why Bates is a quack, then I strongly discourage you from experimenting with user surveys.

Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#278

Post by mrg3_2013 »

Not specific to this, but if you can solve issue with progressive lenses, you have a big market. Progressive lens sucks. They simply do not work and causes too much strain and practically unusable for daily operations. What would be great if there's a digital way where the lens changes depending on your activity. Driving, then go to long vision. In front of laptop - change to reading glass etc. I will be your customer if you solve this

Re: Ask HN: Do your eyes bug you even though your prescription is "correct"?

#280

Post by matt_heimer »

roncesvalles wrote: post #235
kps wrote: post #101

Earlier quoted context omitted.

> I also avoid […] high-index lenses for computer work. Yes! You're the first to mention this. It's not refractive index itself that's the problem, it's dispersion (roughly, the degree to which refractive index varies across the visual spectrum, described by ‘Abbe number’). We've all seen pictures of a prism splitting a beam of white light into a rainbow — for visual purposes, the less split the better. Higher-index…

It's not just about the material. It's also about how the lens is made. For me, choosing "freeform" over "aspheric" was night and day.

Where are you ordering glasses from that you can make selections like this?
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