What is lens coloboma?

What is lens coloboma?

• A. Notch defect of the lens equator
• B. Absence of lens
• C. Microscopically small lens
• D. Excess lens growth

Answer: (A)

Lens coloboma is a localized notch at the edge of the lens (the equator) caused by a sectoral deficiency or absence of the zonular support in that area. Because the zonules are missing or weak in a specific region, the lens edge can form a wedge-like notch, most often in the inferior part. It’s not an absence of the entire lens, nor a uniformly small lens, nor a condition of excessive lens growth—rather, it’s a zonular defect producing a peripheral notch in the lens margin.

Lens coloboma is a localized notch at the edge of the lens (the equator) caused by a sectoral deficiency or absence of the zonular support in that area. Because the zonules are missing or weak in a specific region, the lens edge can form a wedge-like notch, most often in the inferior part. It’s not an absence of the entire lens, nor a uniformly small lens, nor a condition of excessive lens growth—rather, it’s a zonular defect producing a peripheral notch in the lens margin.