Learning objective

Detail the role of each part of the eye, specifically: (a) cornea - bends light (b) iris - regulates light entry through the pupil (c) lens - focuses light onto the retina (d) retina - contains light-sensitive receptors, some of which detect different colors (e) optic nerve - transmits signals to the brain.

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Exam focus

Cambridge IGCSE BiologyCoordination and responseCore content

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Quick explanation

This point belongs to Sense organs, especially Sense organs outcomes.
You need to be able to detail the role of each part of the eye, specifically: (a) cornea - bends light (b) iris - regulates light entry through the pupil (c) lens - focuses light onto the retina (d) retina - contains light-sensitive receptors, some of which detect different colors (e) optic nerve - transmits signals to the brain.
The key ideas to know are Describe.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

Why it matters

This objective helps connect Sense organs outcomes to exam-style questions, flashcards, and revision notes for Sense organs.

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Paper 3Theory (Core)2 marks

Diagram Description

A diagram shows the cornea, iris, pupil, lens, retina, and optic nerve labeled.

a
Describe the role of the cornea in vision.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Describe the function of the optic nerve.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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