Read APPENDIX 4: CONVERSION TABLES text version

APPENDIX 4: CONVERSION TABLES

TABLE 1: CONVERSION OF DIOPTERS TO RADIUS OF CURVATURE

DIOPTERS 36.00 36.25 36.50 36.75 37.00 37.25 37.50 37.75 38.00 38.25 38.50 38.75 39.00 39.25 39.50 39.75 40.00 40.25 40.50 40.75 41.00 41.25 41.50 41.75 42.00 RADIUS 9.38 9.31 9.25 9.18 9.12 9.06 9.00 8.94 8.88 8.82 8.77 8.71 8.65 8.60 8.54 8.49 8.44 8.39 8.33 8.28 8.23 8.18 8.13 8.08 8.04 DIOPTERS 42.25 42.50 42.75 43.00 43.25 43.50 43.75 44.00 44.25 44.50 44.75 45.00 45.25 45.50 45.75 46.00 46.25 46.50 46.75 47.00 47.25 47.50 47.75 48.00 48.25 RADIUS 7.99 7.94 7.90 7.85 7.80 7.76 7.71 7.67 7.63 7.58 7.54 7.50 7.46 7.42 7.38 7.34 7.30 7.26 7.22 7.18 7.14 7.11 7.07 7.03 6.99 DIOPTERS 48.50 48.75 49.00 49.25 49.50 49.75 50.00 50.25 50.50 50.75 51.00 51.25 51.50 51.75 52.00 52.25 52.50 52.75 53.00 53.25 53.50 53.75 54.00 54.25 54.50 RADIUS 6.96 6.92 6.89 6.85 6.82 6.78 6.75 6.72 6.68 6.65 6.62 6.59 6.55 6.52 6.49 6.46 6.43 6.40 6.38 6.34 6.31 6.28 6.25 6.22 6.19 DIOPTERS 54.75 55.00 55.25 55.50 55.75 56.00 56.25 56.50 56.75 57.00 57.25 57.50 57.75 58.00 58.25 58.50 58.75 59.00 59.25 59.50 59.75 60.00 60.25 60.50 60.75 61.00 RADIUS 6.16 6.14 6.11 6.08 6.05 6.03 6.00 5.97 5.95 5.92 5.90 5.87 5.84 5.82 5.79 5.77 5.74 5.72 5.70 5.67 5.65 5.63 5.60 5.58 5.56 5.53

TABLE 2: VERTEX DISTANCE ALLOWANCE FOR LENS POWERS ABOVE 4 DIOPTERS (calculated for average vertex distance of 12mm)

4.00 4.25 4.50 4.75 5.00 5.12 5.37 5.50 5.62 5.75 5.87 6.00 6.12 6.37 6.50 6.62 6.75 6.87 7.00 7.12 7.37 + 3.87 4.00 4.25 4.50 4.75 4.87 5.00 5.12 5.25 5.37 5.50 5.62 5.75 5.87 6.00 6.12 6.25 6.37 6.50 6.62 6.75 7.50 7.62 7.75 7.87 8.00 8.12 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 + 6.87 7.00 7.12 7.25 7.37 7.50 7.62 7.75 8.00 8.25 8.37 8.62 8.75 9.00 9.12 9.25 9.37 9.62 9.75 10.00 10.25 12.00 12.50 12.75 13.00 13.50 13.75 14.00 14.25 14.75 15.00 15.50 15.75 16.25 16.75 17.00 17.25 17.62 18.00 18.12 18.50 18.75 + 10.37 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.37 14.50 14.75 15.00 15.25 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.75 22.25 22.50 23.00 23.50 23.75 24.25 24.75 25.00 25.50 26.00 + 15.50 15.62 15.75 16.00 16.12 16.25 16.50 16.62 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75

*for minus read left to right, for plus, read right to left

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APPENDIX 4: CONVERSION TABLES

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