Questions tagged [vision]

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13 questions with no upvoted or accepted answers
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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 ...
3
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0answers
53 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 ...
2
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0answers
449 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
48 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
37 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. ...
2
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0answers
17 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 ...
1
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0answers
485 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)
1
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0answers
59 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 ...
1
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0answers
16 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 ...
1
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0answers
32 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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16 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, ...
1
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57 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 ...
0
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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 ...