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Questions tagged [vision]

The tag has no usage guidance.

0
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0answers
25 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)
3
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2answers
49 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 ...
0
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0answers
18 views

How do led lights affect eyesight

I've been looking at pc setups that some people create in their offices/homes. While they look fancy I wonder if they could inflict some serious sight damage over the time if they were to be the only ...
1
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0answers
32 views

Interpreting a diagram of eyeball optics [closed]

A very noob question... Eye diagrams illustrate how the lens bends light to focus it at a single point on the retina, such as directly below. I don't understand this. How can we see if all the light ...
3
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2answers
83 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 ...
1
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0answers
15 views

Does wearing glasses at the computer increase nearsightedness?

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 ...
1
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0answers
11 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 ...
2
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0answers
66 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 ...
2
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0answers
34 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 ...
2
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0answers
44 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 ...
1
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0answers
19 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 ...
1
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0answers
11 views

If anything is near the left side of my head in my periphery vision, I get extremely dizzy

This has happened for years. I can only talk on the phone with my right hand. It's really concerning and interesting. I don't expect a fix, I just wondered if this was common or even a thing at all....
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0answers
28 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 ...
2
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1answer
2k 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 ...
3
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0answers
51 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 ...
1
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1answer
91 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'...
8
votes
1answer
138 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 ...
2
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0answers
35 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. ...
1
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0answers
14 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, ...
2
votes
1answer
30 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 ...
3
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0answers
115 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 ...
13
votes
2answers
5k views

Do computer glasses actually work?

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. ...
1
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0answers
15 views

Is enlarging for ease of the eyes related to bad eyes?

When I'm at school and look around me everyone works on 100% viewing sizes, such as in browsers, documents and other applications. However, when I'm working on my laptop I prefer having everything a ...
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0answers
16 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 ...
2
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0answers
39 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?
1
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0answers
52 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 ...
4
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0answers
88 views

Is there a particular term for this eyesight problem?

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 ...
7
votes
1answer
518 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, ...
2
votes
0answers
103 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 ...
9
votes
1answer
16k 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?
19
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2answers
25k 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 ...