Rods and cones synapse with small bipolar.

The rods and cones lie with the outer segment,Ĭontaining pigment, against the choroid layer.

Results in all the different visible colours

The combination of the different cones stimulated.

Types of cones sensitive to either blue, red or

A cone can contain only one type, resulting in 3.Sensitive to different wavelengths of light There are THREE types of iodopsin which are.become dark adapted,īecause it takes time for rhodopsin to be Therefore when you go into a dark place it takes.In bright conditions all of the rhodopsin is.Rhodopsin is highly sensitive to light and can be.Mitochondria found in the inner segment provide.Neurone depolarises and conducts an action If threshold is achieved the adjacent bipolar.Rhodopsin breaks down when stimulated with lightĬhanging the membrane potential and creating a.

and a light absorbing compound, retinal (from.The pigment found in the membranes of the outer.Infoldings of surface membrane contain the by changing the level of polarisation of the.They act as transducers changing light energy.The retina contains light sensitive cells called.The iris contains circular and radial muscles toĬontrol the size of the pupil and therefore theįront view of iris and pupil in high lightįront view of iris and pupil in low light.Will not be stimulated, if it is too high they Too small the photosensitive cells of the retina If the intensity of the light entering the eye is.Consequently it bends light more, allowing light.Which in returns the lens to its thicker normal.Consequently it bends light less, allowing lightĬontracts the diameter of the muscle decreases.This pulls on the suspensory ligaments making.Relaxes the diameter of the muscle increases When the circular muscle in the ciliary body.The lens is attached to the ciliary muscle by the.The lens is surrounded by the ciliary body, whichĬontains a ring of muscle callled the ciliary.This allows light rays to focus no matter what.The lens makes further fine adjustment by.The photosensitive cells in the retina to form an Sufficient light must enter the eye to stimulate.To control the amount of light entering the eye.Light must be focused on the retina, this is.

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