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Criteria for clinically significant refractive error
| ⩾1.50Ds bilateral hypermetropia |
| ⩾1.50Ds bilateral myopia |
| ⩾0.75Dc bilateral astigmatism |
| All astigmatism in combination with significant hypermetropia |
| ⩾1.00 Ds anisometropia |
| Full astigmatic, anisometropic myopic and mild/moderate hypermetropic (+1.50 Ds to +5.00Ds) refractive errors were prescribed. Prescriptions for high hypermetropes are given within 2.00Ds of the full correction. |
