Biology Stack Exchange
Biology Stack Exchange

Questions tagged [eyes]

The discussion of the anatomy and evolution of eyes. Consider using the "vision" tag for questions regarding how the brain interprets information from the eyes.

The tag is used for questions directly relating to the , , and of the eyes.

For related questions on how the brain interprets electrical messages from the eyes, see the tag.

291 questions
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Are rods/cones rejuvenated periodically?

Pretty much what the title states. Some cells/structures in the human body undergo rejuvenation periodically by flushing away older cells and growth of new ones. E.g Skin, Blood Does this (for want of a better word) 'rejuvenation' apply to…
Everyone
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Why do glial cells of the retina become more abundant the closer they are to the optic nerve?

I am doing a project on expression of GFAP in the zebrafish retina. GFAP is a marker for glial cells. I have found that the glial cells are more abundant the closer they are to the optic nerve at the middle of the eye. This may just be because the…
naughts
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Perception of artificial light - flickering

I noticed something strange a couple of years ago. I was walking down the street at night, when it struck me that the street lights were flickering. But, when I turned to take a direct look at the light source it did not flicker any more. In other…
Bram Vanroy
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Cause of short sightedness/ far sightedness

I recently had gone for an eye test. The doctor told that short sightedness/ far sightedness is caused due to shrinking or expanding of the eye. One thing i forgot o ask him was what causes that shrinking/expanding. Can anyone explain it to me?
Ashu
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Are common eye defects inherited?

If one parent is nearsighted and the other is farsighted. One parent developed nearsightedness later in life, while the other was born farsighted and they are both the first ones in their family to have any sort of eye problems. Is there a…
Giota B
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Why do I always close my eyes when someone takes a photo of me using a flash?

Everytime some tries to take a photo of me with a flash I manage to close my eyes (blink). It's not intentional and it's quite annoying. Why am I doing it?
user4230
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Eyelids interconnected?

I've seen a patient who had a Vitrectomy (eye surgery) done on a single eye manifest massive swelling on both eyelids. That seems like having my left hand swell after punching a wall with my right one. Is this example in the eyes rare? How and why…
Frankie
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Screen brightness for reading in dark room

While searching online I did not find any conclusive article on whether it is good or bad for one's eyesight to read on a computer screen in a dark room. Most mention that it will cause strain that will go away after some rest (sleep). My question…
mythealias
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Does my nearsightedness come into play when creating light outlines in the distance?

After looking at a light and closing your eyes, you see an outline of the light. I was curious how my nearsightedness would come into play. I look at a light in the distance without my glasses on and close my eyes, would I be able to distinguish the…
Anthony Trucano
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What are these tiny, almost transparent, dots in my vision?

Sometimes when I stare at a very bright thing such as the sky I see little dots. It's actually more of a circle with a little dot inside it. They are half-transparent and they move around a lot. When I first see them they tend to appear in a group…
sam1370
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How come all my family have brown eyes and I have blue eyes?

My whole family tree up to my grandparents have brown eyes, I have blue eyes, how come? I don't know if it matters but I have not received enough oxygen at birth, doctors said it's probably the reason I'm left handed while my most of my family is…
mountSin
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Are human eyes equally sensitive to AC, and DC lamps?

Definitely anecdotal. This friend is hypermetropic, and uses reading glasses. He doesn't have major issues facing car headlights, or using a torch (the one with a bulb - not a white LED). Yet place him in front of a TV/Computer screen, and he'll…
Everyone
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Difference in frame rates of normal and peripheral vision

I recently encountered an incident in my laboratory. It was evening and the sunlight entered the lab through a window with exhaust fans. So the ray kept flickering at fixed intervals. I noticed that the flickering was more noticeable when it was…
AlphaLife
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How come degraded eyesight still holds with a mirror?

When you use a mirror to look at something, you can position it at an angle arbitrary to your face and still look at an object far away. My question is, for degraded eyesight, how come the picture is still degraded in the mirror? Is it because of an…
Baklava Gain
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What exactly are "floaters"?

i was reading this artical after hearing about it on the news, while reading i saw the term "floaters" which made me remember of a recent Family Guy Episode in which there is a joke about them in Peter's vision. I am wondering, what exactly are…
Memor-X
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