Why does doctors look in to your eyes ?

Do they really see your pain? how?Why does doctors look in to your eyes ?
Yes as most answered its to make sure your pupils dilate in the proper proportions, however they can also tell by the veins in the eyes if you're not sleeping properly, or the colour in the white of your eye will show if you may have anaemia. Also most importantly if one pupil is larher than the other, this is an indication of pressure on the brain and must be dealt with ASAP as it could be a life threatening ailment, i.e. stroke, aneurism or brain haemmorage.Why does doctors look in to your eyes ?
They shine the light in your eyes in order to make sure that your eyes dilate when light hits them, as they're supposed to.
The eyes are the mirror to a lot of things





But basically they are checking to see if your pupils are the same size, if they are reacting to light appropriately and so on.





PEARL pupils equal and react to light -- very important
Umm...okay. They do it so they can see any sign of a disease sickness or w.e. and they do that to check if your eyes have dilated correctly.
Probably to see if ur telling the truth. I'm sure after all that schooling they learned a little bit about body language in order to see if someone is taking them for a ride in order to get Rx drugs.
it has more to do with examining the blood vessels in your eyes and not so much with dilation which would be more important to check with a head injury.


people with diabetes and high blood can have changes with the blood vessels in their eyes.





the doctor cannot assess pain by doing an eye exam.
When a doctor shines a pen light directly at your eyes, both of your pupils (i.e. black dots) are suppose to constrict (become smaller). The main reason for checking your pupils is to make sure your cranial nerves (that pertain to the eyes) are functioning properly. Normal pupils should be round, equal in size, reactive to light, and constrict as well as dilate symmetrically.





Pupils have control over how much environmental light will pass through your eyes. During the day, it is usually bright so your pupils will be fairly small (approx 2mm diameter). At night, when it's much darker, your pupils will slightly enlarge to allow more light to pass through for better vision (e.g. when you wake up in the middle of the night and need to go to the bathroom).





As for your question on pain....that is an experience that is completely subjective. Everyone has a different pain threshold and some people show pain more than others. For example, some cultures are stoic when it comes to expressions; you can't tell for sure whether they are happy, sad, mad, or in pain. Therefore, looking into someone's eyes is NOT 100% accurate in determining whether he/she is experiencing pain. The best way would be to ask them....
I think it has to do with the dilation of your pupils. The lack of functioning of this reflex tells the doctor something in your nervous system is going wrong.
Well that could be it... but the main reason is to see how your pupils respond to light also they can look into the backs of your eyes and see the blood vessels..Its the only place on the body that you can see an accurate picture of someones artery health..