Table 6.
Summary of corneal asphericity values reported in the literature
| Authors | Participants (age range) | Q value, Mean ± SD | Diameter (mm) | |
|---|---|---|---|---|
| Zhang et al. (2011) [ 3 ] | 1052 Chinese (6 – 83 y) | Anterior | - 0.30 ± 0.12 | 6 |
| Nasal | - 0.38 ± 0.16 | |||
| Temporal | - 0.25 ± 0.13 | |||
| Superior | - 0.34 ± 0.19 | |||
| Inferior | - 0.30 ± 0.16 | |||
| Horizontal | - 0.31 ± 0.11 | |||
| Vertical | - 0.31 ± 0.15 | |||
| Xiong et al. (2017) [ 8 ] | 1683 Chinese (30 – 107 y) | Anterior | - 0.28 ± 0.18 | 3 |
| Posterior | - 0.26 ± 0.22 | |||
| Anterior | - 0.28 ± 0.18 | 5 | ||
| Posterior | - 0.26 ± 0.21 | |||
| Anterior | - 0.29 ± 0.18 | 7 | ||
| Posterior | - 0.26 ± 0.22 | |||
| Dubbelman et al (2006) [ 10 ] | 114 Dutch (18 – 65 y) with an equivalent refractive error of - 6.88 and + 3.5 D | Anterior | 0.87 ± 0.11 | 7.5 |
| Horner et al (2000) [ 15 ] | 48 Indian, myopic (11 – 13 y) | Mean of both meridians | - 0.08 ± 0.12 | 4.5 |
| Fuller and Alperin (2013) [ 7 ] | 80 African Americans (21 – 75 y) | Anterior | - 0.26 ± 0.19 | 6 |
| Nasal | - 0.43 ± 0.41 | |||
| Temporal | - 0.19 ± 0.48 | |||
| Superior | - 0.26 ± 0.49 | |||
| Inferior | - 0.19 ± 0.20 | |||
| Horizontal | - 0.29 ± 0.37 | |||
| Vertical | 0.08 ± 2.10 | |||
| 80 Whites (22 – 72 y) | Anterior | - 0.20 ± 0.12 | ||
| Nasal | - 0.27 ± 0.23 | |||
| Temporal | - 0.17 ± 0.12 | |||
| Superior | - 0.26 ± 0.28 | |||
| Inferior | - 0.13 ± 0.16 | |||
| Horizontal | - 0.22 ± 0.14 | |||
| Vertical | - 0.20 ± 0.16 | |||
Abbreviations: Q value, corneal asphericity; SD, standard deviation; mm, millimeters; y, years; D, diopters.