TABLE 1

Amblyogenic Risk Factors

Anisometropia* (spherical or cylindrical) > 1.50 D
Any manifest strabismus
Hyperopia > 3.50 D in any meridian
Any media opacity > 1 mm in size
Astigmatism > 1.5 D at 90° or 180° > in oblique axis (>10° eccentric to 90° or 180°)
Ptosis ≤ 1 mm margin reflex distance—the distance from the corneal light reflex to the upper lid margin; a standard objective measurement of ptosis
Visual acuity: per age-appropriate standards
  • D = diopter.

  • * Anisometropia is a difference in the refractive power of the two eyes.

  • Reprinted with permission from Donahue et al.10 (p 315).