| Data from Ohio Schools, Compiled by Dr. J. Raphaelson |
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| Diopters to Inches 0 diopters = 240 inches -1 diopters = 40 inches -2 diopters = 20 inches -3 diopters = 13 inches -4 diopters = 10 inches -6 diopters = 6.6 inches -8 diopters = 5 inches -10 diopters = 4 inches -13 diopters = 3 inches |
| READING HABITS OF SCHOOL CHILDREN -- GRADES 1 TO 8 |
| Child's Habitual Reading Distance Distance - #Starting #Finish 12 to 10 inches - 287 - 2 ** 10 to 6 inches - 205 - 76 6 to 3 inches - 11 - 331 3 inch or less - 0 - 94 ** 2 / 503 = 00.398 % |
| Dr. Raphaelson's statement: "It can fairly be assumed that what I have found in Clermount County will also be found in nearly all schools in the U.S.A." For the above data, the starting reading average was -3.7 diopters (or 11 inches), with a sigma of 0.9 diopters, and a final reading position of -9.6 diopters (4.2 inches) with a Sigma of 3.3 diopters. |