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| Monozygotic twins | Dizygotic twins | |
|---|---|---|
| Number | 162 | 148 |
| Age (years) | 39.6 (SD 8.8) | 40.6 (SD 8.5) |
| Central retinal thickness (μm) | 211.8 (SD 1.4) | 212.4 (SD 1.7) |
| Refraction (spherical equivalent; D) | −1.5 (SD 2.8) | −1.2 (SD 2.6) |
| Intraocular pressure (mm Hg) | 15 (SD 3) | 15 (SD 3) |
