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Characteristics of the participants’ eyes.
| Feature Name | Values |
|---|---|
| Iris Colour (under IR-enabled camera) | 7 dark, 6 medium, 12 bright |
| Single or double eyelids | 10 single-eyelid, 15 double-eyelid |
| Eye shape |
4 round, 21 almond; 2 protruding, 23 monolid; 5 upturned, 20 downturned |
