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Alternative definitions of anisometropia for sphero-cylinder refractions. An advantage of spherical equivalent is identical value whether plus or minus cylinder notation. The values (A) through (F) all could be utilized to calculate “anisometropia” for a sphero-cylinder refraction. Spherical equivalent anisometropia is the absolute value of (B – E); the meridional anisometropia from the more-minus is the absolute value of (A – D).
