What Is a Forced Duction Test?

How Is the Test Performed?

The doctor numbs the eye to prevent discomfort. Using small instruments, they carefully move the eye in different directions. If the eye moves freely, the issue is usually nerve related. If movement feels tight, a physical restriction is likely. The findings guide the next diagnostic steps.

When Is a Forced Duction Test Needed?

Common reasons include:

• Suspected muscle entrapment after injury.
• Scarring from previous surgeries.
• Unexplained double vision.
• Limited movement patterns in one eye.
• Evaluation before strabismus surgery.

What Do the Results Indicate?

Free movement suggests that muscles and tissues are not physically blocked. Limited movement points to a structural issue around the muscle or tissue. These findings help doctors choose appropriate treatment options. Early evaluation prevents long-term movement issues. The test's clarity helps decision-making.

Why Would A Doctor Perform A Forced Duction Test?

A forced duction test helps a doctor figure out whether an eye movement problem comes from a physical restriction or a nerve control issue. It is most useful when one eye cannot move fully in a certain direction and the cause is not obvious. By gently guiding the eye after numbing, the doctor can feel whether movement is tight or free. Tight movement points to a mechanical problem such as scarring or muscle entrapment. Free movement suggests the muscles are not blocked and the issue may be nerve related.