Disorders Of The Lens Practice Test

What dangerous event can occur if the pupil dilates in a subluxated lens?

Anterior luxation Posterior luxation Cataract formation Retinal detachment

Correct Answer:

Anterior luxation

Explanation:

In a subluxated lens, the zonules holding the lens in place are weak, so the lens position is unstable. When the pupil dilates, the iris moves away and the lens-iris diaphragm can shift forward. This forward movement can push the lens into the anterior chamber, causing pupillary-block–type glaucoma and a dangerous rise in intraocular pressure. That acute forward displacement into the front of the eye is the dangerous event most likely to occur with dilation. Moving the lens backward into the vitreous isn’t as immediately perilous in this scenario, and cataract formation or retinal detachment aren’t acute effects triggered by pupil dilation.

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