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Questions tagged [vision]

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Medical Education - Excluding Audiobooks & Text-To-Speech Software, What Auditory Resources can Students be Directed to use?

Aside from audiobooks, I seldom come across medical education resources for students who either: A. Want to learn by audio B. Need to learn by audio A. There are many students who casually want to ...
JJ123's user avatar
  • 11
6 votes
0 answers
57 views

Do significant numbers of people report colour vision even at very low light intensities?

I was explaining to a 16 year old how rods and cones in the eyes work. I said to him that that is why everything looks black and white at night. To my great suprise he told me he had never experienced ...
Judith Jones's user avatar
2 votes
0 answers
64 views

Can using glasses with a positive prescription when using a computer help prevent or minimize myopia?

I've seen multiple sources linking screen-time on a computer and myopia. If this is correct that exerting our eye-muscles causes this, would using glasses with a positive prescription prevent that? ...
123's user avatar
  • 121
2 votes
0 answers
30 views

Relaxing eyes: what happens if I accommodate past far point

I am working with displays a lot, which causes eyestrain and a little bit of "seasickness" sometimes. To relax the eyes, a common 20-20-20 rule says that one should watch past 20 feet for 20 ...
Imsa's user avatar
  • 21
0 votes
0 answers
23 views

Seeing possible floaters but only for 1-2 seconds

I'm very stressed at this moment in time due to my mother having vascular dementia. I'm getting these floater-type things since about a month ago on the odd occasion. I'm not sure if they are floaters,...
TheWorrier's user avatar
1 vote
0 answers
57 views

Can you go temporarily blind if you experience 18 Hz vibrations?

The Wikipedia article on the BAC TSR-2 jet states that: Shortly after takeoff on XR219's second flight, vibration from a fuel pump at the resonant frequency of the human eyeball caused the pilot to ...
Zaz's user avatar
  • 340
0 votes
0 answers
41 views

Is it medically advisable to have spectacle lenses perfectly aligned with each other?

I have noticed some local brands of spectacles having the lenses slightly angled as shown in the second image below ("If lenses are at an angle"). I believe it is done to have the lenses ...
Nav's user avatar
  • 103
2 votes
0 answers
26 views

Quantitative retinal mosaic analysis corroborating better scotopic vision in colorblind individuals

According to https://www.sciencedirect.com/science/article/pii/S0042698997003398, color blind individuals have been shown to have an increased ability to see in very low light. Has there been any ...
g491's user avatar
  • 323
2 votes
0 answers
106 views

Converting sphere and small cylinder to sphere only for contact lenses

I understand that contact lenses are available which can correct a prescription with both sphere and cylinder components, however these are only available for large-ish values of cylinder (depending ...
Tom V's user avatar
  • 121
1 vote
0 answers
205 views

Is there any research on health effects of OLED screens? [closed]

All screens I've used before are LCDs. Considering now an OLED option on a smartphone. However, there's lots of info about harmful effects of OLED on eyes, among those: PWM flicker, which, while not ...
vitvly's user avatar
  • 231
1 vote
1 answer
57 views

Can colorblind people see any types of images that normally sighted people have a hard time with?

Could one devise a first image that contained a "hidden" sub-image where said sub-image is such that colorblind people would typically have an easier time seeing said sub-image embedded ...
Michael Martin's user avatar
1 vote
0 answers
114 views

When a person who is nearsighted doesn't wear corrective glasses, what happens?

Someone wrongly tagged as duplicate my previous question. The question is: When a person who is nearsighted (eyeglass needs minus sign) doesn't wear corrective glasses, does it make the situation ...
john's user avatar
  • 11
1 vote
1 answer
2k views

What things can trigger scintillating scotomas? Are they sometimes classified benign and not a reflection of a condition requiring further treatment?

This is a different question than Are scintillating scotomas really caused by cortical spreading depression? If so, how is this known to be true? asked almost one year ago in Psychology and Neurology ...
user avatar
3 votes
2 answers
68 views

What is the name of a condition where one cannot/can poorly perceive depth for objects moving towards them

I remember a case where someone apparently had great difficulty perceiving the distance of an object if it was (quickly) travelling towards them. Their depth perception was otherwise fine, but when, ...
Bas's user avatar
  • 133
2 votes
0 answers
50 views

Eye frame rate dropping when tired [closed]

I have always wondered what causes one's frame rate to drop in their eyes when tired. Could anyone explain this? I am talking about the effect when your vision goes almost stuttery
Raiden616's user avatar
  • 121
1 vote
0 answers
2k views

What are those circles and lines I see when I squint at light?

what are those things I see? It happens when I look at a light source (Such as a light bulb) and the circles are supposed to be smaller on the picture. (I recreated what I see)
FuriousBlaze3000's user avatar
3 votes
2 answers
77 views

What brightness level of mobile/desktop/laptop we should keep for better eye care?

What is the level on which it doesn't cause or cause less harm to the eyes or doesn't lead to eye dryness or eye vision problems? My uncle was suggesting me to keep the brightness to a certain high ...
smali's user avatar
  • 173
4 votes
2 answers
153 views

Which one is better? Reading on a computer, on a tablet, or on paper?

I'm a graduate student and I have to spend a lot of time on reading research papers everyday. My question is which of the following is the best choice for eye health? I can either read them directly ...
Chris Kuo's user avatar
  • 143
1 vote
1 answer
186 views

Does wearing glasses while on the computer increase myopia?

Nearsightedness is prevalent in demographic groups that look at screens for most of their time, such as office workers or students. (Saw et al., 2002) Glasses correct the defocusing of the lens in the ...
DK2AX's user avatar
  • 201
1 vote
0 answers
21 views

Factors Scientifically Shown to Affect Myopia

What are the main factors that have been reasonably established to affect myopia? For example, here is a study which shows that children who spend a lot of time outside have far better eyesight than ...
VSO's user avatar
  • 175
3 votes
0 answers
821 views

Is "voluntary accommodation" common?

I can't find any resource online about what I call "voluntary accommodation": the ability to contract the lens of the eye manually in order to blur or clear the vision. My optician advised me to ask a ...
Theo Cuse's user avatar
2 votes
0 answers
102 views

My left and right eye have a consistent, clear difference in color perception. Why?

Myself, my brother, and a friend of mine all have noticed independently that our left and right eyes perceive colour differently from the other eye. As compared to my vision with both eyes open, my ...
NimbleThicket's user avatar
3 votes
0 answers
66 views

How many times in a lifetime a man can do laser vision/eyesight correction/surgery?

Is it true that laser vision/eyesight correction/surgery is strictly recommended to do only once in a lifetime and if after first laser correction someone's eyesight returned to bad condition the only ...
Erba Aitbayev's user avatar
2 votes
0 answers
46 views

Downward Double-Vision

If I focus on the ring in this image (the ring is 1 cm tall on my monitor, I stand 300 cm away, the room is dark, and I cover one eye), I actually see an "8" formed from double-vision where the lower ...
bobuhito's user avatar
  • 261
0 votes
0 answers
32 views

For painting/drawing models, what is the maximum exposure time and maximum light intensity of a spot shining in your eyes at a fixed position?

For painting/drawing models, what is the maximum exposure time and maximum light intensity of a spot shining in your eyes at a fixed position? That is: before the damage to your eyes becomes ...
O0123's user avatar
  • 151
2 votes
1 answer
3k views

Does eyesight significantly vary from day-to-day?

I think I need glasses and my visit to the optometrist has confirmed this. I've never worn glasses, and I'm new to all this, so I don't completely understand how things work. These past few weeks, I ...
samseva's user avatar
  • 121
2 votes
0 answers
58 views

Are moving "ghosts" after waking up normal or it is sign of disorder? [closed]

Sometimes when I wake up I see moving silhouette of a human in my room. It lasts roughly 3–4 seconds. Then it fades away. These silhouettes have no detail, so I cannot sort out its faces or any ...
Erba Aitbayev's user avatar
0 votes
2 answers
141 views

Increase vision clarity with eye exercices?

I haven't worn my glasses in a like a year and put them on today. I noticed that vision in one eye is slightly "off" as in, the glasses rated -2.5 power aren't correcting it fully. The difference isn'...
Carpetfizz's user avatar
8 votes
1 answer
238 views

Safe and state-of-the art method of laser vision/eyesight correction/surgery?

I have defective vision, particularly shortsightedness. Obviously, it is quite widespread phenomenon. I tried several times to get accustomed to contact lenses, but without success. It irritates my ...
Erba Aitbayev's user avatar
2 votes
0 answers
43 views

Does prolonged use of VR headsets harm your vision?

Virtual reality (VR) technology is starting to get to a point where it will become more common in the mainstream. The technology involves placing screens very close to your eyes to create the vision. ...
user1605665's user avatar
1 vote
0 answers
20 views

How good are snow goggles for UV protection?

Snow goggles are sometimes used to protect against photokeratitis (a.k.a. snow blindness). How good are snow goggles for UV protection? E.g., do they block 99 to 100 percent of both UVA and UVB rays, ...
Franck Dernoncourt's user avatar
2 votes
1 answer
40 views

How to find out how advanced a hospital is for a specific speciality

I need to have cataract surgery and I have some options (indirectly) of where the surgery will be performed. Based on my medical coverage, I actually have a choice of a few doctors, and each doctor ...
Mr Magoo's user avatar
4 votes
0 answers
193 views

Causes of rapidly-progressing myopia [closed]

Imagine a patient, say, Steve. Steve is 19 years old, and began experiencing signs of myopia at 10 or so. He spent years wearing glasses on and off, and progressed to a -1.5 prescription (with a ...
TheEnvironmentalist's user avatar
14 votes
3 answers
5k views

Do computer glasses actually work? [closed]

It's very likely that I will be spending most of my life in front of a computer monitor. This is necessary for my profession and the fact that improving technology requires us to look at screens more. ...
Iarwain's user avatar
  • 313
2 votes
0 answers
25 views

Is it a good exercise for the eyes to work with different font sizes or would refocusing strain the eye?

In my work I deal with several screens, and recently I have started using different pieces of software for coding. When I installed the new one, I noticed that the font size there is a bit bigger, and ...
SBF's user avatar
  • 121
2 votes
0 answers
41 views

Is working on a computer for a long time everyday bad for health? [duplicate]

Is looking continuously at a computer screen for a long time everyday bad for health? If yes, then what care should be taken while working on a computer?
KTPATEL's user avatar
  • 209
1 vote
0 answers
61 views

Does vision really improve by wearing spectacles?

I had a discussion with friends that. One of them who had an eye power of -0.75 has improved and now has an eye power of -0.50 . This happens because he is always wearing spectacles and has a good ...
prateek's user avatar
  • 11
5 votes
0 answers
138 views

Is there a particular term for this eyesight problem? [closed]

I have had for the past few months, and today I spend a couple hours trying to identify it and have had no luck. Certain areas of my vision will change to be "darker" - but it seems as it those ...
Lukas Palmer's user avatar
7 votes
1 answer
1k views

What causes the cornea to change shape in astigmatism?

I was diagnosed with astigmatism last summer, I've never had any noticeable vision problems before (I'm 20 years old). The shift from fine to terrible happened quite fast. I've visited an eye doctor, ...
ChLys's user avatar
  • 71
5 votes
1 answer
2k views

What is the angular resolution of the 'ideal' human eye?

The visual acuity page on wikipedia suggests 1.8 arcmin @ 1km away (but says nothing about the relationship expected between distance and angular resolution) whilst the page on angular resolution ...
jheriko's user avatar
  • 151
9 votes
1 answer
23k views

Can crossing my eyes damage them? [closed]

I am able to cross my eyes when I want. Can doing this somehow damage my vision by giving me strabismus?
Krzysztof Majewski's user avatar
22 votes
2 answers
37k views

Is Low Blue Light helpful for preserving eyesight?

I'm a coder and interested in save my eyesight. I've met the term named low blue light. Monitors decrease the level of blue color and theoretically protect my eyes. Here's a quote from monitor ...
Alex Antonov's user avatar