2006-12-07 21:32:15 · 11 answers · asked by rain021 2 in Science & Mathematics ➔ Medicine
If they flick a small pen light or flashlight quickly before your eyes, they are checking for pupil responses. Your pupil, the little black opening, will open up more and be a bigger black opening in darker light. The MORE light that shines into our eyes, the more the pupil closes up and becomes a smaller black opening. Dilated pupils means the pupil is open wide and makes your iris (the color part of your eye) look very dark. If a doctor shines a special kind of a light tool called an opthalmoscope, she or he is looking through the opening, the pupil, and all the way through the clear liquidy gel inside your eye to the back wall of your eye. That back wall is covered with capillaries, or, tiny blood vessels. That area in the back of your eyes is called a "retina". Many diseases, such as high blood pressure and diabetes, will cause those capillaries to rupture. That can cause blindness.
Here is an image of an opthalmoscope:
http://z.about.com/d/vision/1/0/I/2/directophthalmoscopenei.jpg
Here is the view of a retina through an ophthalmoscope:
http://images.google.com/imgres?imgurl=http://www.yorku.ca/eye/ophthal2.gif&imgrefurl=http://www.yorku.ca/eye/retview.htm&h=237&w=233&sz=40&hl=en&start=4&tbnid=rgpAj6OdJS9rNM:&tbnh=109&tbnw=107&prev=/images%3Fq%3Dophthalmoscope%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DX
Here is a normal pupil and iris:
http://webvision.med.utah.edu/imageswv/pupil.jpeg
Here is a dilated pupil, or, wide opened:
http://static.flickr.com/22/34282695_92794c865b_m.jpg
2006-12-07 21:57:59 · answer #1 · answered by Anonymous · 1⤊ 1⤋
To check if your circular muscles of the eye dilate the pupil as they should, if not that might point to a neurological problem.
2006-12-08 16:00:54 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Patois has it absolutely correct.
I have considerable experience in the matter. I am a diabetic and have to be very careful with everything in my body including my eyes. I have an annual retina screening and regular check ups so I have been through these drills many times.
2006-12-07 22:10:24 · answer #3 · answered by gimpalomg 7 · 1⤊ 1⤋
Military Grade Tactical Flashlight - http://FlashLight.uzaev.com/?vyiR
2016-07-11 02:05:41 · answer #4 · answered by ? 3 · 0⤊ 0⤋
To see if your pupils dilate correctly during a light-changing environment.
2006-12-07 21:34:49 · answer #5 · answered by Cold Fart 6 · 1⤊ 1⤋
To check the response of the dialtion of your pupils.
2006-12-07 21:35:48 · answer #6 · answered by asexystudd 3 · 1⤊ 1⤋
they're looking for your pupil's reacition to light. apparently that could be a sign of some problems; other than drugs
2006-12-07 21:34:43 · answer #7 · answered by uknowme 6 · 1⤊ 1⤋
To check your pupil responce.
2006-12-07 21:35:13 · answer #8 · answered by Feeling new @ 42 4 · 1⤊ 1⤋
they pretend they'r checkin your iris reactions but that a big lie!
they jus like doing it cuz it really annoys most people!
i'd do it all the time if i knew id get away with it!!
2006-12-07 23:09:54 · answer #9 · answered by Anonymous · 0⤊ 3⤋
I guess there eyes are bad too?
2006-12-07 21:40:50 · answer #10 · answered by Ari 7 · 0⤊ 2⤋