snow glare injury

1).so, how would you know if you have snow blindness?( like what are the symptoms)  
2).what is the length of time for you to stare at the light rflected are, in order for your eyes to be damaged.
3). can a doctor realize that your cornea is burnt when examining eyes?

[Sandra M Brown, MD]

If you have been out in the snow on a sunny day without eye protection, and you later develop severe light sensitivity, red eyes, watering, and a strong scratchy feeling, then you have damaged your corneas with reflected UV light.  There is no specific formula for how long you can be outside, it depends on the time of day and sun intensity.  An eye doctor can make this diagnosis through office testing.  Time is the best treatment.