Snow Blind.

The amount of light that can damage your eyes depends on the brightness of the light and how long you're exposed to it:

 

Sunlight

Staring directly at the sun for even a few seconds can cause permanent retinal damage.

 

Dim light

Staring directly into a dim light, like a reading light, for more than a few seconds can cause discomfort.

 

Chronic exposure

Exposure to light that's not as intense over days or weeks can also cause permanent eye damage. This is called photo-oxidative damage and can injure the retina.

 

The iris, the coloured part of your eye, is your eye's main defence against bright light. When intense light hits your eye, the iris constricts your pupil to protect your retina.

 

Snow blindness, also known as photokeratitis, is a painful eye condition that occurs when the cornea is exposed to too much ultraviolet (UV) light: Snow blindness is a type of sunburn that affects the eyes. It's caused by damage to the cornea, the transparent front layer of the eye, from UV rays.

 

 

Sunshine and shadows - Oslo, Norway.

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