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Creado por charlottec1999
hace más de 9 años
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Pregunta | Respuesta |
The Cornea | The cornea is a transparent 'window' with a convex shape and a high refractive index. |
The Iris | The iris is the coloured part of the eye. It is made up of muscles that control the size of the pupil and intensity of light entering the eye. |
The Lens | The lens changes shape to focus light from the objects at variable distances. It's connected to the ciliary muscles by the suspensory ligaments. |
The Retina | Images are formed on the retina, which is covered in light-sensitive cells. These cells detect light and send the signal to the brain to be interpreted. |
The Far Point | The far point is the furthest distance that the eye can focus comfortably. |
The Near Point | The near distance is the closest distance the eye can focus on. |
Short Sight | Short sight is when you can't focus on distant objects. This is because the eyeball is too long . It can be corrected by diverging lenses. |
Long Sight | Long sighted people can't focus on near objects. This happens when the cornea and lens are too weak or the eyeball is too short. It is corrected with converging lenses. |
Eye Surgery | Eye surgery uses narrow and intense lasers to correct eyes. The laser is used to vaporise some of the cornea to change the persons focus ability. |
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