Sometimes the vision can be so blurry that it is difficult to read.  Generally, no treatment is required and the vision improves over the next 6 to 18 months.

Mountain climbers can also experience a form of damage to the eyes.  At high altitudes the retina can start to have bleeding.  This is thought to be a result of decreased oxygen to the retina.  Fortunately, the process resolves and vision improves when the climber descends to low altitude.  Climbers can also have overexposure to ultraviolet light that can cause the vision to have a red tint.  Mountain climbers should wear sunglasses that filter low wavelength and ultraviolet light.

Another form of photoxicity is caused by glassblowing.  The molten glass reaches very high temperatures and can give off a form of thermal radiation.  This radiation can cause damage to the lens of the eye.  The damage occurs over several decades.  Thankfully, this problem has been mostly eliminated with the use of protective goggles.

Arc welders are also prone to eye damage.  Arc welding produces ultraviolet light.  If the eye is unprotected damage can occur to the surface (cornea) of the eye.  This damage can occur within hours of the exposure.  The symptoms include tearing, pain, redness and sensitivity to light.  The eyes usually heal in about two days.

We have all heard about the loss of the ozone layer and its potential to cause skin cancer.  The thinning of the ozone layer can also affect the eyes.

Ozone is a naturally occurring molecule in the upper layers of the atmosphere.  It absorbs ultraviolet radiation from the sun.  As the ozone layer decreases, more ultraviolet rays reach the surface of the earth.  These rays can increase the incidence of skin cancer and cataracts.  The ozone layer is thinnest as you get closer to Antarctica.  In parts of Argentina and Chile, for example, there is an increase in skin cancer and cataracts.

The natural lens of the eye absorbs ultraviolet rays.  During cataract surgery the lens is removed, but the lens implant is designed to absorb these dangerous rays.

I hope everyone is enjoying the start of summer,  the long days and sun filled sky that only Montana can provide and to preserve your vision of health always wear sun protection.