"Eyelid" provides the opened eye ratio using the eyebrow position, the upper-eyelid position and the under eyelid position.

Step 1. Prepare a photograph that the subject's eyes in the primary gaze position.
Step 2. Expand the eyebrow and eyelid.
Step 3. Set the red marks on the corneal limbus.
Step 4. Using ▲ / ▼ buttons, set the green marks on the eyebrow, the upper eyelid margin and the lower eyelid margin.
Step 5. Then measured the upper eyelid position (UEP), eyebrow position (EBP) and opened-eye ratio(OER).

- You can change the initial corneal size (transverse diameter and longitudinal diameter) .
- "Eyelid" has the camera with a sprit level. Therefore you can get a straight photograph.
- You can save the result as a JPEG format.