![]() Cone cells only connect to one other neurone, so each individual stimuli can be distinguished. Visual acuity is the ability to tell apart two points that are close together. This is because each cone cell connects to only one neurone, so it takes higher intensities of light to trigger a generator potential. Cone cells only detect high light intensity.Different intensities of light in these pigments allow for colour to be seen. There are three types: red-sensitive receptors, green-sensitive receptors and blue-sensitive receptors. Cone cells give information in colour.There are around 6 million of these cells which help to produce the clearest image possible. This stimulates a generator potential, which sends the impulse along a bipolar nerve to the brain.Ĭone cells are located in the centre of the retina in an area called the fovea. This causes a chemical change that increases the permeability of the membrane to Na+ ions.The light is absorbed by light-sensitive optical pigments in the photoreceptors.The photoreceptors in the retina produce impulses that travel through the optic nerve to the brain.Ĭonversion of Light into Electrical Impulses Light rays enter through the pupil and are focused onto the retina by the lens. There are two types of photoreceptors in the retina: cones and rods. They contain different light-sensitive optical pigments, so they are sensitive to different wavelengths of light. The retinas of the eye contain photoreceptors that detect light. Receptors, which are specialised cells, help to make up the sense organs to detect stimuli. Photoreceptors (A-level Biology) Light Receptors in the Eye ![]()
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