Common defects of the human eye
I can describe common defects of the eye and how we treat them.
Common defects of the human eye
I can describe common defects of the eye and how we treat them.
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Lesson details
Key learning points
- Common defects of the eye (e.g. cataracts, short- and long-sightedness) and how they impair vision.
- How common defects of the eye can be treated.
- Interpretation of ray diagrams to explain how common eye defects affect vision, and the effects of corrective lenses.
- How colour blindness occurs and its impact on vision.
Keywords
Lens - An object that can focus light rays. In the eye, it brings light rays to focus on the retina.
Retina - The back of the eye which senses light brightness and colour.
Focus - The process of bringing light rays together to converge at a single point creating a clear image.
Refraction - Occurs when light travels from one transparent medium to another, causing a change in direction.
Common misconception
Mistakes with the defects and treatments in vision caused by long- and short-sightedness (e.g. getting the symptoms or the type of lenses mixed up) or how lenses actually correct vision are common.
The conditions are dealt with separately with clear and concise information conveyed and supported with diagrams and reinforced with questions that focus on these mistakes and misconceptions.
Equipment
None required.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What name is given to the point on the retina on which light focuses?
Q2.What changes the shape of the lens?
Q3.Starting with the light entering the eye, put the following steps in order to describe how we see.
Q4.Which part of the eye changes size to control how much light enters the eye?
Q5.Label the parts of this diagram.
cornea
lens
retina
Q6.Match the description of the lens to the object it is focusing on.
when the ciliary muscles relax to focus on objects that are far away
when the ciliary muscles contract to focus on objects that are near