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. Author manuscript; available in PMC: 2008 Oct 1.
Published in final edited form as: J AAPOS. 2007 May 23;11(5):473–479. doi: 10.1016/j.jaapos.2007.02.011

Table 1.

Patient Groups for Each Comparison

Group 1 Group 2 Group 3 Group 4 Group 5
Unilateral vs.
bilateral disease 		Visually significant
unilateral cataract		 Visually
significant
bilateral cataract
Severity of visual
impairment in a
single ophthalmic
disorder 		ROP 20/200 or
poorer in both eyes		 ROP 20/200 or
poorer in one
eye, 20/50-
20/125 in fellow
eye		 ROP 20/50-
20/125 in both
eyes		 ROP 20/50-20/125 in
one eye, 20/20-20/40
in fellow eye		 ROP 20/20-20/40
in both eyes
Different treatment
regimens 		Optical correction
(accommodative
ET, anisometropia)		 Surgery
(ET)		 Optical
correction and
surgery
(ET, cataracts)		 Optical correction,
surgery, and
occlusion therapy
(ET, cataracts)
Alternative
treatments for a
single ophthalmic
disorder 		Unilateral cataracts
optically corrected
with IOLs		 Unilateral
cataracts
optically
corrected with
aphakic contact
lenses

Abbreviations: ROP=retinopathy of prematurity; ET=esotropia; IOL=intraocular lens.