All Questions

Filter by
Sorted by
Tagged with
0
votes
1answer
47 views

Simulating the physics of an imperfect eye

I am working on a project where the purpose is to show the most common ocular ametropia (myopia, astigmatism and farsightedness) to lay people. One of the demonstrations I would like to do is: the ...
2
votes
0answers
38 views

Do virtual images exist in the real world? [duplicate]

I have been reading an article here in physics stack exchange that talks about if it is possible to see virtual images, and i read an answer saying it is actually your brain that understands the ...
0
votes
3answers
85 views

When does the retina fail to recognize images of two closely separated points as distinct?

Our eye is a lens and lenses have a resolving power. The resolving power of a lens, physically speaking, is related to how good two closely separated points A and B can be distinguished as separate. ...
0
votes
0answers
24 views

Derivation of the relationship between snellen rows and diopters

Here's an incorrect derivation of the conversion from rows of a Snellen chart to diopters -- this derivation results in the correct sign but too small a value: Interpret ...
2
votes
0answers
499 views

Why do my glasses make the ground look tilted?

I just started wearing glasses to correct my myopia today. I have -0.25 spherical and cylindrical power in my right eye and -0.5 spherical and -0.25 cylindrical in the left eye. Everytime I look at ...
-1
votes
2answers
62 views

How do our eyes restructure the picture of objects “right side up”? [closed]

I hope I am posting this in the correct site. I am puzzled with the following sentence: Time and space are compressed into a point of no dimension through which images of the things around us are ...
1
vote
1answer
2k views

Ray diagram of focussing on a compound microscope

When we use a usual biology class compound microscope, we need to focus the stage (place the object) to the "correct" position. It is just in that sweet spot that the image is sharp and clear. So we ...
0
votes
2answers
396 views

How does a colored glass work?

If I look through a colored glass, I see all the objects colored as the glass. Why? How does the color of the glass transfer to the image?
0
votes
1answer
165 views

Magnification in eye

NOTE: This is a dynamic question. There is just ONE question that is being asked among the following. So please answer that one only according to given conditions: (Do mention which question is ...
1
vote
1answer
119 views

At what distance we see actual size of object?

At different distances object is seen of different sizes but there is some distance at which actual size of object is seen through eyes. Is it 25cm?
1
vote
1answer
50 views

Do all rays of light from an object a being imaged by a camera pass through the focal point before being recorded on the image plane?

Basically I'm trying understand the limitations of using the pin-hole model for a camera.
1
vote
1answer
934 views

Why does a specific static image “move” when moving my head? (glass user)

I am a daily PC user. As most users, I have a taskbar (using Windows) that shows icons of programs. My two screens are big (24") and I'm at ~60cm distance from them, so fairly often I need to turn my ...
0
votes
0answers
692 views

Gaze tracking with the pupil-glint response how does the geometry work?

I am struggling to understand the geometry behind the pupil glint response (see above) (With only one light source). I understand that you use the glint to find the corneal centre (Centre of corneal ...
0
votes
2answers
10k views

Why Least Distance of Distinct Vision is treated as image distance in the lens equation.

Least distance of distinct vision is the minimum object's distance that is able to produce a distinct image on the retina. Yet, it is treated as image's distance while applying lens equation. Say, ...
11
votes
2answers
1k views

How do a microscope's optics expose defects in the user's vision?

I've got cataracts in both eyes. My vision is correctable to 20/30, so the cataracts are essentially a non-issue in daily living. But when I use a microscope, which I do daily, (binocular, zoom 7x-30x)...
1
vote
1answer
1k views

Correcting for bad eyesight on display monitors [duplicate]

I think it would be neat if one could configure one's eyesight parameters (astigmatism and myopia in my case), viewing distance, and perhaps age into a special display driver, such that a computer ...
2
votes
3answers
9k views

How do contact lenses work?

I understand how telescope, microscope and glasses work. But how do contact lenses work?