South Tuen Mun Government Secondary School 1999 00

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South Tuen Mun Government Secondary School 1999 - 00 Integrated Science Project 1. The

South Tuen Mun Government Secondary School 1999 - 00 Integrated Science Project 1. The Structure of Eye. 2. Corrections of long sight and short sight.

The structure of eye Eye muscle lens retina pupil cornea iris Blind spot

The structure of eye Eye muscle lens retina pupil cornea iris Blind spot

Find out the uses of the different parts of the eye from your textbook!

Find out the uses of the different parts of the eye from your textbook!

Do you want to learn more?

Do you want to learn more?

conjunctiva Protects the cornea Eye muscle Rotates the eyeball cornea Allows light to pass

conjunctiva Protects the cornea Eye muscle Rotates the eyeball cornea Allows light to pass through Refracts light into eye Retina Contains rods for black and white vision, and cones for colour vision lens Refracts and focuses light onto the retina iris Regulates the size of the pupil and hence the amount of light entering the eye Optic nerve Blind spot No cones or rods Transmits nerve impulses to the optic centre in the cerebral cortex

Long sight & Short sight

Long sight & Short sight

Long sight image formed behind the retina

Long sight image formed behind the retina

Reasons for long-sight 1. The eye lenses are too thin. 2. The eyeballs are

Reasons for long-sight 1. The eye lenses are too thin. 2. The eyeballs are too short.

Long sight is corrected by convex lens image formed on the retina

Long sight is corrected by convex lens image formed on the retina

Short sight image formed in front of the retina

Short sight image formed in front of the retina

Reasons for short-sight 1. The eye-lenses are too thick. 2. The eyeballs are too

Reasons for short-sight 1. The eye-lenses are too thick. 2. The eyeballs are too long.

Short sight is corrected by concave lens image formed on the retina

Short sight is corrected by concave lens image formed on the retina

Group members Leader : Chu Chi Ming Secretary : Lam Shu Chi Artist :

Group members Leader : Chu Chi Ming Secretary : Lam Shu Chi Artist : Chan Chi Yeung Computer Technician(1) : Siu Sik Lam Computer Technician(2) : Po Man Yung

Reference • New Integrated Science 2 • Mastering Basic Concept in Biology 2

Reference • New Integrated Science 2 • Mastering Basic Concept in Biology 2

The End

The End