On Reflection: Retro-illumination in Veterinary Ophthalmic Photography
John Mould
Eye Veterinary Clinic, Leominster, Herefordshire, United Kingdom
Purpose: To illustrate the value of the tapetal reflex in ophthalmic photography of the dog and cat.
Methods: Most dog and cat eyes contain a tapetum, a layer of cells situated in the inner choroid immediately outside the choriocapillaris. The tapetum is brightly coloured in shades of green, yellow or orange and its function is to reflect light back onto the photoreceptors to maximise the stimulus in dim light. The “red reflex” is important in clinical examination and ophthalmic photography in man. In most...