Ace the NBEO Histology Challenge 2026 – Unveil Your Path to Optometric Brilliance!

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What is the histology of the iris posterior epithelium?

Non-pigmented epithelium

Pigmented epithelium with melanin-containing cells

The iris posterior epithelium is a pigmented epithelial layer. It is made up of melanin-containing cells, giving the iris its color and helping absorb stray light. This layer is distinct from nonpigmented or squamous epithelia and is continuous with the pigmented epithelium that supports the iris–ciliary body complex.

Stratified squamous epithelium

Simple cuboidal epithelium

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