Table 2.
Spherical Equivalent, Degree of Myopia, and Severity of Mirror Artifacts
| Variables | Mirror Artifacts (186/200 Eyes) | No Mirror Artifacts (121 Eyes) | P |
|---|---|---|---|
| Spherical equivalent, mean ± SD* | −4.54 ± 5.12 | −0.12 ± 2.59 | <0.001† |
| Myopia status, n (%) | |||
| Emmetropia, SE = 0 D | 11 (5.91) | 13 (10.74) | |
| Mild myopia, SE < 0 to > −2.0 D | 14 (7.53) | 21 (17.36) | |
| Moderate myopia, SE = −2.0 to > −6.0 D | 79 (42.47) | 24 (19.83) | <0.001‡ |
| High myopia, SE ≤ −6.0 D | 57 (30.65) | 3 (2.48) | |
| Hyperopia, SE > 0 D | 25 (13.44) | 60 (49.59) | |
| Artifact severity vs. SE, mean n ± SD | |||
| 1/5 regions | −3.87 ± 18.08 (34) | NA | |
| 2/5 regions | −4.35 ± 30.84 (61) | NA | |
| 3/5 regions | −4.30 ± 21.17 (23) | NA | 0.730§ |
| 4/5 regions | −6.07 ± 9.31 (12) | NA | |
| 5/5 regions | −4.91 ± 32.47 (56) | NA | |
| Artifact severity vs. VA, mean logMAR ± SD (Snellen)‖ | |||
| 1/5 regions | 0.26 ± 0.16 (20/37) | NA | |
| 2/5 regions | 0.28 ± 0.16 (20/38) | NA | |
| 3/5 regions | 0.38 ± 0.21 (20/48) | NA | 0.040§ |
| 4/5 regions | 0.41 ± 0.12 (20/51) | NA | |
| 5/5 regions | 0.51 ± 0.34 (20/65) | NA |
*
86/200 eyes with mirror artifacts have spherical equivalence data.
†
Calculated using two-tailed t-test.
‡
Calculated using χ2 test (α = 0.05).
§
Calculated using analysis of variance.
‖
198/200 eyes with mirror artifacts have visual acuity data.