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How to use a Binocular Indirect
Ophthalmoscope
Selecting a Condensing Lens
Most practitioners find performing a thorough indirect
examination requires at least two condensing lenses: a 28
or 30 diopter lens for routine examinations or when viewing
through smaller pupils; and, a 20 diopter lens for routine
examinations or when increased magnification is desired
for making a diagnosis of a specific pathology. An even
lower power lens, like a 14D or 15D, is helpful when viewing
the posterior pole. Conversely, when viewing through
undilated eyes, a 40 diopter lens offers the widest field
possible.
