| lenses | Pieces of glass or other transparent materials used for magnification or increased visual acuity. (12 Dec 1998) |
|---|---|
| lenses, intraocular | Artificial implanted lenses. (12 Dec 1998) |
| contact lenses | Curved shells of glass or plastic applied directly over the globe or cornea to correct refractive errors. (12 Dec 1998) |
|---|---|
| contact lenses, extended-wear | Hydrophilic contact lenses worn for an extended period or permanently. (12 Dec 1998) |
| contact lenses, hydrophilic | Soft, supple contact lenses made of plastic polymers which interact readily with water molecules. Many types are available, including continuous and extended-wear versions, which are gas-permeable and easily sterilised. (12 Dec 1998) |
| trial lenses | A series of cylindrical and spherical lens's used in testing vision. (05 Mar 2000) |