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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Optom Vis Sci. 2010 Feb;87(2):87–95. doi: 10.1097/OPX.0b013e3181c750b1

Table 2.

Definitions of Group 1 (Very Important to Detect and Treat Early) Conditions in the VIP Study3

Amblyopia
  Presumed Unilateral: ≥ 3 line interocular difference, a unilateral amblyogenic factor*,
   and worse eye VA ≤ 20/64
  Suspected Bilateral: a bilateral amblyogenic factor, worse eye VA < 20/50 for 3-year-
   olds or < 20/40 for 4-year-olds, contralateral eye VA worse than 20/40 for 3-year-
   olds or 20/30 for 4-year-olds
Strabismus: Constant in primary gaze
Refractive Error
  Hyperopia ≥ 5.0 D
  Astigmatism ≥ 2.5 D
  Myopia ≥ 6.0 D
*

Strabismus, anisometropia (as defined in Table 1), or a difference in spherical equivalent of ≥0.50 D when at least one eye had >3.50 D of hyperopia were considered unilateral amblyogenic factors.