Loading…
Loading…
GCSE Biology · key term
The light-sensitive layer at the back of the eye, containing receptor cells that detect light.
Used by AQA, Edexcel and OCR
Specification 4.5.2.3 · Paper 2
The light-sensitive layer at the back of the eye, containing receptors that detect light intensity and colour.
Revise: Structure and Function of the EyeFor you to see an object clearly, light from it must be focused onto the retina, the light-sensitive layer at the back of the eye. Retinal receptors produce electrical impulses, which travel along the optic nerve to the brain. The brain processes this information to produce vision.
Specification 2.15B, 2.17B · Paper 1
The light-sensitive layer at the back of the eye containing rod and cone cells.
Revise: Structure and Function of the EyeFor this to work, light must first be directed onto the light-sensitive retina.
The light-sensitive layer at the back of the eye where a clear image needs to form.
Specification B3.1d, B3.1e · Paper 1 (Foundation), Paper 3 (Higher)
The light-sensitive layer at the back of the eye; its receptor cells convert light into electrical impulses.
Revise: The eyeThe cornea is the transparent, curved covering at the front of the eye. Its curved surface refracts—bends—incoming light and begins directing it towards the retina. Its shape is fixed, so it provides a largely fixed amount of refraction.
A layer of light-sensitive receptor cells at the back of the eye where a sharply focused image should form.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: The EyeThe cornea and lens bring rays from each point on the object together on the retina at the back of the eye. Light-sensitive receptor cells in the retina detect the light and produce electrical impulses that travel to the brain. If the rays do not meet on the retina, the image appears blurred.
The light-sensitive layer at the back of the eye, where a clear image must be focused.
On an eye diagram, distinguish the retina at the back of the eye from the sclera around its outside.
In an explanation of focusing, name both refracting structures: the cornea bends incoming light and the lens changes shape to produce a sharp image on the retina.
Link each correction to its effect on light: a clear replacement lens lets more light reach the retina; a corrective lens brings the focal point onto the retina.
Create a free account to read GCSE Biology revision notes for your exam board and track your progress.