Where an optometrist or ophthalmic medical practitioner tests the sight of a patient, he or she must perform, for the purpose of detecting signs of injury, disease or abnormality in the eye or elsewhere:an examination of the external surface of the eye and its immediate vicinity; an intra-ocular examination, either by means of an ophthalmoscope or by such other means as he or she considers appropriate, andsuch additional examinations as appear to the optometrist or ophthalmic medical practitioner to be clinically necessary.The following categories of patient are currently eligible for NHS sight tests: under 16s, those aged 16 to 18 in full-time education, those aged 60 and over, the registered blind or partially sighted, people prescribed complex lenses, diagnosed diabetics, diagnosed glaucoma sufferers, people aged 40 who are close blood relatives of glaucoma sufferers, those advised by an ophthalmologist that the risk of developing...