Effect of adding atropine to orthokeratology on eye elongation and myopia progression in children.

Use of atropine (0.025%) as the lubricant fluid used when inserting overnight orthokeratology contact lenses onto the cornea of the (experimental) eye. (The fluid normally used is saline) Dose: one drop, once daily, for two years, when inserting lenses at night. Administered by parent for younger children and by participant for older children: monitored by parental diary in both cases. Cross-over between eyes at one year with no washout period (for example: right eye receives atropine for one year followed by saline for one year, whereas left eye receives saline for one year followed by atropine for one year)