Which description best matches the equine fundus?

• A. Tapetum dorsal: Often blue-green; Non-tapetum ventral: Usually dark; Optic disc: Pink and circular
• B. Tapetum ventral: Often blue-green; Non-tapetum dorsal: Usually dark; Optic disc: Pink and circular
• C. Tapetum dorsal: Usually dark; Non-tapetum ventral: Usually blue-green; Optic disc: Red and oval
• D. Tapetum dorsal: Often golden; Non-tapetum ventral: Usually dark; Optic disc: Pink and square

Answer: (A)

In the horse, the tapetum lucidum sits on the dorsal part of the fundus and typically shines blue-green, while the ventral retina is non-tapetal and appears dark. The optic disc is pink and circular. This combination—dorsal tapetum with blue-green color, dark ventral non-tapetal area, and pink circular optic disc—fits the equine fundus pattern best. Other descriptions that place the tapetum ventrally, or describe colors or shapes that don’t match (such as a dorsal dark tapetum or an optic disc that’s red, oval, or square) don’t align with the usual equine anatomy.