TY - JOUR T1 - Hard and soft contact lenses: a comparison JF - Drug and Therapeutics Bulletin JO - Drug Ther Bull SP - 97 LP - 99 DO - 10.1136/dtb.12.25.97 VL - 12 IS - 25 A2 - , Y1 - 1974/12/06 UR - http://dtb.bmj.com/content/12/25/97.abstract N2 - Contact lenses may be used to correct refractive errors, to treat diseased eyes, and to improve the appearance of disfigured eyes. Hard and soft lenses are now available. They have different properties and their relative merits depend upon the purpose for which the lens is required. ER -