This book is not a story. This book is a study book for those who likes to study science. I put this way for those who are so lazy to study in their actual books. So, yeah. Hope this book helps you for your knowledge about science.
Actually, the les...
1 The eye is a sensory organ of sight. It is sensitive to light.
2 The spherical human eyes are held by muscles in the bony sockets of the skull.
3
Three pairs of muscles control the movements of the eyeballs.
4 The tear gland produces tears to clean the eyes and kill microorganisms.
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Photo 1.2 Front view of the human eye
5 The wall of the eyeball is made up of three layers: • the sclera • the choroid • the retina
6 (a) The sclera is the outer layer of the eyeball. It is white, tough and opaque. (b) The choroid is the middle layer of the eyeball. It has black pigments and a lot of blood vessels. (c) The retina is the innermost layer of the eyeball. It has many receptors that are sensitive to light. These are called photorceptors (cones and rods).
7 Figure 1.11 shows the internal structure and functions of different parts of the eye.
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Figure 1.11 Parts of the eye and their functions
How do we see
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