The eye (biology only)

Biology (Separate Science) · GCSE · AQA · AQA GCSE Biology - Foundation (8461) · Specification point · 4.5.2.3 · Homeostasis and response · The human nervous system

Correcting long-sightedness and short-sightedness

Accommodation of the eye

Structure of the eye

Pupil adjustment to light intensity

Surgical correction of refractive errors

Ray diagrams of refractive eye defects

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Learning Objectives

4.5.2.3 The eye (biology only)

Content	Key opportunities for skills development
$Students should be able to relate the structures of the eye to their functions. This includes: accommodation to focus on near or distant objects adaptation to dim light. The eye is a sense organ containing receptors sensitive to light intensity and colour.$
$Students should be able to identify the following structures on a diagram of the eye and explain how their structure is related to their function: retina optic nerve sclera cornea iris ciliary muscles suspensory ligaments. Accommodation is the process of changing the shape of the lens to focus on near or distant objects. To focus on a near object: the ciliary muscles contract the suspensory ligaments loosen the lens is then thicker and refracts light rays strongly. To focus on a distant object: the ciliary muscles relax the suspensory ligaments are pulled tight the lens is then pulled thin and only slightly refracts light rays. Two common defects of the eyes are myopia (short sightedness) and hyperopia (long sightedness) in which rays of light do not focus on the retina.$

Content

Key opportunities for skills development

Students should be able to relate the structures of the eye to their functions. This includes: accommodation to focus on near or distant objects adaptation to dim light. The eye is a sense organ containing receptors sensitive to light intensity and colour.

Students should be able to 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.

The eye (biology only) (4.5.2.3) | AQA GCSE Biology - Foundation (8461) | KnowledgeSet