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.
These resources will be removed by end of Summer Term 2025.
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
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
Loading...
Starter quiz
6 Questions
cornea
iris
lens
ciliary muscles
cornea
lens
retina
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
Exit quiz
6 Questions
