Using Surgical Microscope for Sclera Buckling and Transscleral Cryopexy: An Alternative Procedure of Treatment for Rhegmatogenous Retinal Detachment

Table 1

Areas viewed through three-mirror contact lens (modified from Schepens [12]).

	Lens I	Lens II	Lens III	Lens IV
	(Contact lens)	(Lens)	(Lens)	(Lens)
Areas viewed	30 degrees around the macula	From 30 degrees to equatorial fundus	Peripheral fundus	Extreme fundus periphery
Areas posterior to the limbus	The posterior pole of the fundus	13–17 mm* (chord length)	10–15 mm* (chord length)	9 mm* (chord length)

∗An additional 0.5 millimeter should be added for each additional diopters of −3.0 in eyes with myopia.