Thanks for emailing that article!
Low pressures are generally below five or so, but everyone is different. Just as some eyes are more sensitive to high pressure, some eyes are more easily troubled by low pressures.
A condition called hypotony is generally considered to be less than 6 mm Hg. When the eye pressure is too low it can cause several distortions of the retina, lens and cornea that can degrade vision.
Treatment of hypotony is especially important when it is associated with visual loss. Hypotony may be treated with a variety of techniques, depending on the cause.
Last reviewed on April 19, 2011