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The Iris

The Iris. Physical Properties of the Iris. - The iris is a thin circular structure within the eye - The iris is what is considered your “eye colour” it can be many different shades such as: brown, blue, green, hazel, black, grey and in some extreme cases purple, or red.

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The Iris

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  1. The Iris

  2. Physical Properties of the Iris - The iris is a thin circular structure within the eye - The iris is what is considered your “eye colour” it can be many different shades such as: brown, blue, green, hazel, black, grey and in some extreme cases purple, or red. - The iris has two layers, the first layer is pigmented and it is called the stroma. It is what gives your eye the colour - The seconds layer is made up of pigmented epithelial cells - The iris is a muscle that controls the amount of light that enters the eye - The iris is also divided into two different parts. The pupillary zone and the ciliary zone. - The pupillary zone is the inside part of they eye that forms a boundary for the pupil - The ciliary zone is is the rest of the iris that extends to the ciliary body

  3. How it affects vision The iris is a muscle that controls the amount of light that enters the eye . It grows in dim light and shrinks in bright light. It helps your vision by not allowing an inaccurate amounts of light so that it you can see more clearly. = =

  4. How the Iris protects your eye The iris controls the amount of light entering the eye, so it prevents from too much light from entering your eye and causing blindness, or too little light entering the eye and causing dark blindness. There are three main causes of blindness: Snow Blindness: Night Blindness: Light Over-Exposure: (Temporary)

  5. Diseases associated with the Iris Iritis is an inflammation that affects your iris. Though most of it’s causes are unknown, the common cases are due to genetics or an underlying systemic condition. Although there are few diseases that affect the iris, if left untreated iritis can cause glaucoma or vision loss.

  6. Can you see without the Iris? The iris controls the amount of light going into your eye. It would be very hard to see without this feature. When you look into a bright light, your iris closes the pupil until the right amount of light gets in. When you are in dim light, your pupil dilates so you can see better. Dilated Pupil Constricted Pupil

  7. The End

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