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A zonular cataract, also known as a "lamellar cataract," is a type of lens opacity where cloudiness is limited to a specific layer (or zone) of the lens. It often looks like a cloudy shell surrounding a clear center.
read more about zonular cataract ...These cataracts are typically congenital or develop in early childhood. They often occur because of a brief "insult" to the lens during development, such as a metabolic imbalance or maternal infection.
Under a slit-lamp exam, a zonular cataract often shows "riders," small, linear opacities that extend from the cloudy layer toward the edges of the lens.
If the cloudy layer is dense enough to block the central visual axis, it can cause "amblyopia" (lazy eye), where the brain doesn't learn to see through that eye properly.
If the cataract is small, it may simply be monitored. However, if it hinders visual development, surgery is required to remove the cloudy lens and replace it with an IOL.
Yes. Regular age-related cataracts usually cloud the whole lens over time, whereas zonular cataracts are layered and often appear in children.
It is frequently bilateral (in both eyes), especially when the cause is genetic or due to a systemic issue during fetal development.
Only if the cataract is large or thick enough to prevent the eye from developing clear vision. Many small zonular cataracts never require surgery.