Which condition is described as tremor of the lens itself?

Which condition is described as tremor of the lens itself?

• A. Iridodonesis
• B. Aphakia
• C. Phacodonesis
• D. Uveitis

Answer: (C)

Tremor of the lens itself is phacodonesis. This occurs when the zonular fibers that hold the lens in place are weakened or damaged, so the lens becomes unstable and can tremble or rock with eye movements. On exam, you may notice the lens wobbling within the pupil or capsule during movement or gentle tapping of the cornea. This is different from iridodonesis, which is tremor of the iris itself and usually arises when the lens is absent or markedly displaced, so the iris shows the wobble rather than the lens. Aphakia refers to the absence of the lens, which can produce iridodonesis as a sign. Uveitis is inflammation of the uveal tract and does not involve a tremor of the lens or iris.

Tremor of the lens itself is phacodonesis. This occurs when the zonular fibers that hold the lens in place are weakened or damaged, so the lens becomes unstable and can tremble or rock with eye movements. On exam, you may notice the lens wobbling within the pupil or capsule during movement or gentle tapping of the cornea.

This is different from iridodonesis, which is tremor of the iris itself and usually arises when the lens is absent or markedly displaced, so the iris shows the wobble rather than the lens. Aphakia refers to the absence of the lens, which can produce iridodonesis as a sign. Uveitis is inflammation of the uveal tract and does not involve a tremor of the lens or iris.