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Questions tagged [optics]

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1
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0answers
29 views

Double vision from one eye? [on hold]

I have recently experienced getting double vision out of one eye. When I cover my dominant right eye the double vision corrects and become a solid image? I am not asking if it is possible to get ...
2
votes
1answer
24 views

Do different microscopes and attached cameras differ in crop factor between each other?

I analyzed a bunch of microphotographs recently and used "% of image area" to describe the area of structures (chorionic villi, had to show their density in placenta). However my professor suggested I ...
2
votes
1answer
18 views

Why does white light viewed through optical chopper appear purple/blue?

I looked at a light like the one shown here through a fidget spinner (I believe I was observing near where the "blades" meet the inner portion) and noticed that it appeared purple/blue, particularly ...
2
votes
1answer
6k views

What is the minimal focal length of the human eye?

What is the minimum length to which the focal length of our eye can go, even when considering the blurred images too.
1
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2answers
107 views

Which organism can point us to the evolution of sight?

I'm trying to identify the basic biological mechanisms for sight. Could you help me with identifying any organism that has the most basic ability to see objects? Most importantly, creatures ...
1
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2answers
238 views

Are brown eyes healthier than blue eyes? [closed]

I have read somewhere brown eyes have more melanin than blue eyes and as melanin protects our body from cancers, I thought that brown eyes are more healthier.
1
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0answers
495 views

Is the human eye supposed to see the lense effect?

Just as the GoPro cameras, we need lenses to be able to focus. Nevertheless, we can see the "fisheye effect" on the shots taken by GoPros. I am talking about this: Is it possible to notice the "fish ...
-1
votes
1answer
287 views

How do humans know what goes on in optical illusions? [closed]

Optical illusions are designed to deceive humans, I think. That thing is moving! It really is! It's moving! However, user Konrad Rudolph just told me what went on in a different optical illusions ...
3
votes
1answer
89 views

Neurophotonics vs. Optogenetics

What is the difference between the two? I see them frequently listed together in conference descriptions but can't seem to find anything that clearly explains the difference.
1
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0answers
93 views

GFP brightness calculation

So this question is part math, part biology, but I'm asking about the biology part here (or maybe the chemistry part). Basically I'm asking about my attempt to calculate the possible brightness per ...
0
votes
0answers
18 views

Clarification of the brightness of bioluminescent proteins

One basic thing I'm not too clear on, which I would like to be clear on, is the brightness per mass unit of GFP or luciferase. I was having trouble finding a resource that would state the brightness ...
9
votes
1answer
4k views

Why does my eyes see a red spot when over exposed to light?

When I looked into my projector when it was on the blue screen it left a red spot in my vision. I should not have tried it but all the colors left a red spot. Why not a blue or yellow spot was left?
2
votes
1answer
7k views

How can alcohol cause blindness?

Strong alcoholic beverages (e.g. moonshine) are reported to have caused blindness amongst some people. How exactly can alcohol make someone go blind? Is that because different forms of "rubbing" ...
2
votes
1answer
376 views

Can the retina emit light?

The retina is light sensor, which converts light to an electrical signal. LEDs can both emit and receive light. Similarly, is it possible to apply electricity to retina to generate light? Simply put,...
15
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1answer
4k views

Why does black and yellow indicate danger?

It is a well-known fact that combination of black and yellow indicates danger or poisonousness. In western society it seems obvious this comes from bees and wasps, but it seems like many tropical ...