Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

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

news.ycombinator.com

Post reply on HN
Print view View original

261–270 of 334 posts

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

#261

Post by instagib »

notfed wrote: post #194
instagib wrote: post #146

I used an app iOS “eye movement training” for free post concussion. The slide rule looking eye training is also kind of rough. A string with two or three beads on it. All fun things that could make me puke from doing too much.

This is part of what's referred to as "vision therapy". Optometrists would tell you to go to a paid expert---because purportedly some people do it wrong---but IMO you can just YouTube it.

I don’t think YouTube is the solution. It took me 1 year plus to recover and the iPad part was take home work. Much more intensive in person.

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

#262

Post by bartman »

tiahura wrote: post #172
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:…

What sort of prescription is right for Oculus?

You can get specific insets for the headsets from places like VR Optician. I’ve had some made with my normal prescription and they work perfectly. The people running VR Optician are actual opticians so you can also ask them if any correction factor would be needed for your particular situation.

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

#263

Post by bartman »

chiph wrote: post #258
01100011 wrote: post #219

About 15 years ago or so I was part of a study for Zeiss wavefront lenses. They used some sort of interferometer to map my vision and generated a set of aspherical lenses based on that. They were absolutely the best pair of glasses I ever owned hands down. No chromatic aberration. Absolutely crystal clear vision. Granted, this was before presbyopia set in. As far as I could tell, they never really rolled out the syst…

The problem as I see it is that the diopter system only has a limited number of different profiles. So if you fall in between a diopter (need more than a 2.5 but less than a 2.75, say) the lenses won't be perfect and you'll have eyestrain. Presbyopia hit me about 10 years ago. Some people I know use all-day contacts for distance vision then wear glasses on top for computer use and reading. I'm considering it.

Zeiss i.Scription, linked in a sibling thread, solves the coarse diopter scale as well.

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

#264

Post by dustingetz »

kedarkhand wrote: post #259
dustingetz wrote: post #246

Earlier quoted context omitted.

early stage keratokonus, if this is true you need to get the corneal crosslinking procedure done asap while you are young as the condition progresses rapidly in your 20s. The double (triple, N-ary) vision can be corrected by special contact lenses. You may need a specialist ophthalmologist for this diagnosis. https://en.m.wikipedia.org/wiki/Keratoconus see “signs and Symptoms” image, and note that is advanced, as a 1…

Shit, It did match, looking at the text through the edge of a card does make it clear for me. Although the blurriness is not as extreme as given in the wiki page.

https://www.reddit.com/r/Keratoconus/ -- but do not freak out, most cases are completely treatable with scleral contact lenses, social media bubbles up the outliers. Next step is ophthalmologist, ask for a corneal topography (photograph and measure the surface shape of your eye w/ a computer) to establish a baseline and monitor for progression. Not all ophthalmologist offices have the corneal topography machine so ask for that on the phone. https://en.wikipedia.org/wiki/Corneal_topography To get a KC diagnosis they will likely want to see progression over time in these topography readings. You want to get this sorted while you are young, the corneal cross-linking procedure will halt the progression of the disease and "lock in" your current vision. I did not get the CXL procedure when I was young (it was still experimental back then) and regret it, my vision is fine with correction but the scleral lenses are a pain and it's unclear if i'll be able to read in bed without lenses in my old age.

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

#265

Post by fy20 »

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…

A few years ago an optician convinced me to get some fancy 1.67 index lenses, but I couldn't deal with the chromatic abrasion. The text at the peripheral parts of my monitor were clearly split into their RGB components. For frontend work it was impossible, as I couldn't tell if something was not aligned or it was just the chromatic abrasion.

Now I always go for the thickest lenses (which are also usually the cheapest) for this reason. My prescription is -3.75, and there isn't any noticeable difference with thinner lenses.

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

#266

Post by fy20 »

walterbell wrote: post #193
globnomulous wrote: post #179

Earlier quoted context omitted.

Hear, hear! Here's a good way to test your glass's refraction index. On your desktop find a small red icon with something white in the center. Stare directly at it. Now turn your head until the icon is at the edge of your vision. If your lenses are cheap polycarbonate, the white part of the icon will appear to move towards the edge of the icon or even out of it. Most non-cheapo glasses today in the US use Trivex. It'…

Among non-glass options, CR-39 is a good choice for computer glasses with prescriptions weaker than -5: - high (58) Abbe number - thick (1.5 index) - cheapest Thickness and weight can be mitigated with a smaller frame, e.g. vintage options. Actually buying CR-39 lens might require solving a dark pattern maze of online or offline options, since the cost is so low.

https://www.selectspecs.com/ if you are in Europe. I've been using them for years.

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

#267

Post by raffraffraff »

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 have a very weird situation where my right eye was fine but my left, for reasons unknown, has a thicker lens. This can be happen with cataracts but I'm just under 50 and have zero clouding. The eye doctor said it's not myopia in the "usual" sense but the end result is the same: myopia prescription lens.

Thing is, I ignored it for about 10 years and my brain simply ignored whatever signal was coming from that eye. I'd look at things and see no blurring unless I closed my right eye. However, at a certain crossover distance my brain "switches over" because my left eye has amazing close vision and my right eye doesn't. I can actually feel it when this happens, like a physical sensation. No headaches, but it is "odd".

Anyway, I decided to get glasses, and it turns out I need two different prescriptions. One is close up (not longsightedness, it is still a myopia lens). The other is for 1m-∞

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

#268

Post by jbornhorst »

OP here - wow, didn’t expect this to resonate so strongly! Thanks to everyone who’s commented or reached out directly.

I’m currently lining up interviews to learn more about your experiences. If you’ve commented here but haven’t connected yet, feel free to email me at: jbornhorst [at] gmail [dot] com.

I’m especially interested if you’ve experienced persistent discomfort even after updating your prescription professionally (headaches, eye strain, subtle blur, etc.). Pure research, no selling. Your insights will help shape a better solution.

I’ll do my best to reply promptly to everyone. Thanks again, and please keep the stories coming!

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

#269

Post by fsckboy »

fy20 wrote: post #265
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…

A few years ago an optician convinced me to get some fancy 1.67 index lenses, but I couldn't deal with the chromatic abrasion. The text at the peripheral parts of my monitor were clearly split into their RGB components. For frontend work it was impossible, as I couldn't tell if something was not aligned or it was just the chromatic abrasion. Now I always go for the thickest lenses (which are also usually the cheapest…

chromatic aberration

https://en.wiktionary.org/wiki/aberration#Noun

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

#270

Post by dnh44 »

fy20 wrote: post #265
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…

A few years ago an optician convinced me to get some fancy 1.67 index lenses, but I couldn't deal with the chromatic abrasion. The text at the peripheral parts of my monitor were clearly split into their RGB components. For frontend work it was impossible, as I couldn't tell if something was not aligned or it was just the chromatic abrasion. Now I always go for the thickest lenses (which are also usually the cheapest…

All the high index lens materials suffer from chromatic aberration.

The lens material you've now chosen actually has the best optical properties out of all the plastic lens materials. Its only downside is that the refractive index is only 1.5 which does mean they will be a little bit thicker than the high index ones.

You could also try a material called Trivex which also has low chromatic aberration while being a little thinner than the material you are using which is called CR-39

Post reply on HN