Vascular tunic: pigmented and vascular layer.
	• Choroid coat – middle layer
	•iris – controls amount of incoming light
	•ciliary body – attaches and focuses lens.
	Choroid pigment absorbs excess light, vessels supply other tissues.
	Tapetum lucidum – reflective portion of choroid in eyes of many animals.
	Anterior iris is pigmented to reduce excess light entering eye.