An autoclavable diagnostic ophthalmic lens system includes a biconvex lens element having front and rear surfaces and a housing in which the biconvex lens element is mounted. The biconvex lens element is fabricated from a glass having an index-of-refraction greater of 1.7 or greater. The glass composition...http://www.google.com.au/patents/US7499219?utm_source=gb-gplus-sharePatent US7499219 - Optimized lens for indirect ophthalmoscopy
