| Definition . | Description . |
|---|---|
| Linear distances at midpupillary line | |
| Pretarsal show (mm) | Distance between upper palpebral margin and upper eyelid crease |
| Palpebral aperture height (mm) | Distance between upper palpebral margin and lower palpebral margin |
| Pretarsal show + palpebral aperture height (mm) | Distance between lower palpebral margin and upper eyelid crease |
| Upper lid show (mm) | Distance between upper palpebral margin and lower margin of eyebrow |
| Brow-eye unit height (mm) | Distance between lower palpebral margin and lower margin of eyebrow |
| Ratios | |
| Chen's ratio | (Pretarsal show + palpebral aperture height)/(palpebral aperture height + pretarsal show + upper lid height) |
| Fold/eye ratio | Pretarsal show/palpebral aperture height |
| Ratio of palpebral aperture height to upper lid show | Palpebral aperture height/upper lid show |
| Definition . | Description . |
|---|---|
| Linear distances at midpupillary line | |
| Pretarsal show (mm) | Distance between upper palpebral margin and upper eyelid crease |
| Palpebral aperture height (mm) | Distance between upper palpebral margin and lower palpebral margin |
| Pretarsal show + palpebral aperture height (mm) | Distance between lower palpebral margin and upper eyelid crease |
| Upper lid show (mm) | Distance between upper palpebral margin and lower margin of eyebrow |
| Brow-eye unit height (mm) | Distance between lower palpebral margin and lower margin of eyebrow |
| Ratios | |
| Chen's ratio | (Pretarsal show + palpebral aperture height)/(palpebral aperture height + pretarsal show + upper lid height) |
| Fold/eye ratio | Pretarsal show/palpebral aperture height |
| Ratio of palpebral aperture height to upper lid show | Palpebral aperture height/upper lid show |
| Definition . | Description . |
|---|---|
| Linear distances at midpupillary line | |
| Pretarsal show (mm) | Distance between upper palpebral margin and upper eyelid crease |
| Palpebral aperture height (mm) | Distance between upper palpebral margin and lower palpebral margin |
| Pretarsal show + palpebral aperture height (mm) | Distance between lower palpebral margin and upper eyelid crease |
| Upper lid show (mm) | Distance between upper palpebral margin and lower margin of eyebrow |
| Brow-eye unit height (mm) | Distance between lower palpebral margin and lower margin of eyebrow |
| Ratios | |
| Chen's ratio | (Pretarsal show + palpebral aperture height)/(palpebral aperture height + pretarsal show + upper lid height) |
| Fold/eye ratio | Pretarsal show/palpebral aperture height |
| Ratio of palpebral aperture height to upper lid show | Palpebral aperture height/upper lid show |
| Definition . | Description . |
|---|---|
| Linear distances at midpupillary line | |
| Pretarsal show (mm) | Distance between upper palpebral margin and upper eyelid crease |
| Palpebral aperture height (mm) | Distance between upper palpebral margin and lower palpebral margin |
| Pretarsal show + palpebral aperture height (mm) | Distance between lower palpebral margin and upper eyelid crease |
| Upper lid show (mm) | Distance between upper palpebral margin and lower margin of eyebrow |
| Brow-eye unit height (mm) | Distance between lower palpebral margin and lower margin of eyebrow |
| Ratios | |
| Chen's ratio | (Pretarsal show + palpebral aperture height)/(palpebral aperture height + pretarsal show + upper lid height) |
| Fold/eye ratio | Pretarsal show/palpebral aperture height |
| Ratio of palpebral aperture height to upper lid show | Palpebral aperture height/upper lid show |
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