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Peripheral iris thinning and contraction furrows in Down syndrome versus controls.
| Iris color | Down syndrome | Control | p-value | ||
|---|---|---|---|---|---|
| Iris thinning | Iris contraction furrows | Iris thinning | Iris contraction furrows | ||
| Blue | 8 | 0 | 6 | 4 | |
| Hazel | 4 | 0 | 3 | 3 | |
| Brown | 15 | 7 | 1 | 25 | |
| All | 27 | 7 | 10 | 32 | <0.001* |
*p-value for both all iris thinning and contraction furrows in Down syndrome versus control.
