Pupil testing, an essential part of the eye exam, is done to determine how well the pupil responds to light and rule out neurological damage regarding RAPD.
1. Usually it is done with a diffuse light source, such as the transilluminator.
2. If pupil motion is difficult to determine with #1, then try using a more focused light source, such as the light of the BIO.
3. If motion is still difficult to determine with #3, you may be able to detect a more distinguished motion with the slit lamp.