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Table 2 Refractive error.

From: A survey of visual function in an Austrian population of school-age children with reading and writing difficulties

 

Sphere (D)

Cylinder (D)

 

Control Group

Referred Group

Control Group

Referred Group

Mean

+0.38

+0.30

-0.18

-0.13

Standard deviation

± 1.56

± 1.17

± 0.56

± 0.39

Range

-8.00 to +8.00

-5.75 to +9.50

-3.00 to 0.00

-3.50 to 0.00

  1. Mean, standard deviation and range of spherical and cylindrical refractive errors in the control group and the referred group.
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BMC Ophthalmology

ISSN: 1471-2415

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