Edexcel IGCSE Biology · Spec 2.92
Eye Muscles, Ligaments and Responses
Covers explain accommodation for near and distant objects, Describe antagonistic control of pupil size and Link each muscle response to its effect.
Biology revision video
Eye Muscles, Ligaments and Responses
Prefer to watch on YouTube? Open this video on YouTube.
Spec 2.92
What you need to know
- Explain accommodation for near and distant objects
- Describe antagonistic control of pupil size
- Link each muscle response to its effect
Active recall
Quick check
Answer each question before opening the answer.
What happens to suspensory ligaments when focusing on a near object?
They become slack
Which iris muscles contract in bright light?
The circular muscles
Why does the lens become thinner for distant vision?
Distant light rays need less refraction to focus on the retina
Biology video companion
Keep your notes and exam practice together
The free Biology workbook follows every video in specification order.