glossary

Ophthalmic lens that utilizes a steepening of curves to incorporate corrections for distance vision through intermediate range, to near vision (usually in lower part of lens), with smooth transitions and no bifocal demarcation line.

Corrects presbyopia by varying optical power progressively from an upper to lower part. No lines.

One of the groups of eye drops used to treat glaucoma. They work by increasing the rate at which aqueous passes out of the eye.