Poor vision at a distance
Concave Lenses are used in the treatment of myopia or shortsight.
is the measure of the amount of myopia, and this fully correcting glass may be worn in the slighter forms of short-sight.
In higher degrees, where full correction might increase the myopia by inducing a strain of the accommodation, somewhat weaker glasses should be used for near work.
In cases of myopia or short-sight owing to weakness of the internal recti muscles, the eyes in looking at a near object, instead of converging, tend to turn outwards, and so double vision results.
Patients with high myopia, greater than 6.00 diopters, have an increased risk of developing a retinal tear, hole, or detachment; a posterior staphyloma; a posterior vitreous detachment; or glaucoma.