Iris in the vertebrate eye functions to: Receptors Mcqs September 18, 2019 BILAL KHATTAK0 A.Move the lens B.Alter the diameter of pupil C.Close the eye lids in bright light D.Secrete the vitreous humorRelated Mcqs:Main functions of rods and cones in retina of vertebrate eye are:In a vertebrate eye the chief function of rods and cones is that:Focal length of lens is controlled by:If a light source in front of our eyes suddenly becomes bright then:Blind spot in the vertebrates eye is located:Oxyntic cells are found in:GLOOMY:Which of the following structures in our eye are not derived from ectoderm:Rods of cones in the vertebrate eyed differ in one of the following respects:Cavity of vitreous humour is: