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Summary Eye notes and questions for GCSE AQA Biology
Simple and comprehensive notes to get best grades for GCSE Biology on Eye and its structure Practice questions at the end of the document!
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The EyeBy the end of this module
you should know / be able to:
• Relate the structures of the eye to their functions. This
includes accommodation to focus on near or distant objects,
and adaptation to dim light.
• The eye is a sense organ containing receptors sensitive to
light intensity and colour.
• Identify the following structures on a diagram of the eye and
explain how their structure is related to their function: retina,
optic nerve, sclera, cornea, iris, ciliary muscles, suspensory
ligaments
• Accommodation is the process of changing the shape of the
lens to focus on near or distant objects.
• To focus on a near object: the ciliary muscles contract, the
suspensory ligaments loosen, the lens is then thicker and
refracts light rays strongly.
• To focus on a distant object: the ciliary muscles relax, the
suspensory ligaments are pulled tight, the lens is then pulled
thin and only slightly refracts light rays.
• Two common defects of the eyes are myopia (short
sightedness) and hyperopia (long sightedness) in which rays
of light do not focus on the retina.
• Generally these defects are treated with spectacle lenses
which refract the light rays so that they do focus on the retina.
• New technologies now include hard and soft contact lenses,
, Eye Structure
(complete the annotations and the table)
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