Which part of the eye is indicated above?

The optic nerve.

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Which part of the eye is indicated above?

The lens.

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What are the two types of retinal cells in the eye?


What is the role of each?

1Cone cells - allow us to see very precisely and detect colour.


2Rod cells - more sensitive, allowing us to see in the dark.

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What is the fovea?

The fovea is the point where light focuses on the retina.


This region contains the highest concentration of cone cells and gives the sharpest image.

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Which part of the eye is indicated above?

The fovea.

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What is the role of the cornea and the lens?

To refract (bend) light, so that it focuses on the fovea.

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Which part of the eye is indicated above?

The retina.

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What is the iris reflex?

An automatic reflex that constricts or dilates the pupil in response to light.


It allows the eye to control the amount of light that reaches the retina.

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Why is the iris reflex important?

If too much light reaches the retina, it could get damaged.


If too little light reaches the retina, we won't be able to see clearly. 

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Which part of the eye is indicated above?

The pupil.

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Which part of the eye is indicated above?

The iris.

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Which part of the eye is indicated above?

The radial muscle.

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Which part of the eye is indicated above?

The circular muscle.

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Which two muscles are found in the iris?

Circular muscle and radial muscle.

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Which eye's pupil is constricted, and which is dilated?

Ais constricted.


Bis dilated.

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What happens to the radial and circular muscles when the pupil dilates?

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What happens to the radial and circular muscles when the pupil constricts?

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