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HealthyCounted ratings come from accounts older than 7 days and were made on or after publication. Finished readers weigh ×1.0. Readers who have not finished yet weigh ×0.5. Did-not-finish ratings are shown but not counted.
Editions
4 editions- Paperback · English · 1982Creative Arts Book Company · 152 pages · 9780916870485
- Other · English · 1991Flamingo · 146 pages · 9780006547464
- Other · English · 1985Triad · 157 pages · 9780586063613
- Other · English · 1971Chatto and Windus · 142 pages · 9780701107888
Ocular RefractionEyeDiseasesAccommodation and refractionOrthopticsVision disordersAccomodation and refractionVision
