What is lens luxation?

What is lens luxation?

• A. Complete displacement of the lens
• B. Partial dislocation of the iris
• C. Iridodonesis without lens movement
• D. Absence of the lens behind the pupil

Answer: (A)

Luxation means the complete displacement of the crystalline lens from its normal position, usually due to ruptured or weakened zonular fibers. When the lens is luxated, it is no longer held behind the pupil and may end up in the anterior chamber or the vitreous cavity, depending on the direction of displacement. This is distinct from subluxation, where the lens is only partially displaced and often remains in partial contact with the iris with phacodonesis. Iridodonesis refers to trembling of the iris due to instability of the lens-iris support and does not describe the lens itself being fully displaced. Absence of the lens behind the pupil describes aphakia or another condition, not luxation. So luxation corresponds to the lens being completely displaced from its normal position.

Luxation means the complete displacement of the crystalline lens from its normal position, usually due to ruptured or weakened zonular fibers. When the lens is luxated, it is no longer held behind the pupil and may end up in the anterior chamber or the vitreous cavity, depending on the direction of displacement. This is distinct from subluxation, where the lens is only partially displaced and often remains in partial contact with the iris with phacodonesis. Iridodonesis refers to trembling of the iris due to instability of the lens-iris support and does not describe the lens itself being fully displaced. Absence of the lens behind the pupil describes aphakia or another condition, not luxation. So luxation corresponds to the lens being completely displaced from its normal position.