90 D Volk fundus lens.
The 90 D lens is used in conjunction with a slit lamp biomicroscope to provide a stereoscopic indirect view of the ocular fundus. The clinical picture is an indirect view of the posterior pole and as far anterior as the equator. Being hand-held, it requires some practice to maintain alignment but does not require contact with the globe. Table 1 summarizes the clinical advantages and disadvantages of the 90 D lens.
D005069:Evaluation Studies as Topic; D005654:Fundus Oculi; D006801:Humans; D007909:Lenses; D008853:Microscopy / Q000295:instrumentation / Q000379:methods*