B. Lens opacity.
C. Amount of tear production.
D. Vitreous hemorrhage.
The instrument shown in the picture above represents Maddox rod.
The Maddox rod test
- It can be used to subjectively detect and measure a latent, manifest, horizontal or vertical strabismus for near and distance. The test is based on the principle of diplopic projection..
- The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens, which refracts light rays so that a point source of light is seen as a line or streak of light.
- Equipment used:
- Maddox rod.
- Small fixation light.
- Prisms(to assess the degree of deviation)