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Light Defraction

The document discusses the types of photoreceptors in the retina, highlighting rods for low light and cones for color detection. It explains the fovea's role in detailed vision and its limited visual field. Additionally, it notes that rods enable night vision, resulting in grayscale images when cones are inactive.

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debjani.bhattacharya
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12 views2 pages

Light Defraction

The document discusses the types of photoreceptors in the retina, highlighting rods for low light and cones for color detection. It explains the fovea's role in detailed vision and its limited visual field. Additionally, it notes that rods enable night vision, resulting in grayscale images when cones are inactive.

Uploaded by

debjani.bhattacharya
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PPTX, PDF, TXT or read online on Scribd
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Retina:

1.Photoreceptor Types:
•Rods: Sensitive to low light; important for night vision (black & white).
•Cones: Detect colours; work best in bright light.
2.Cone Cell Types:
•3 types: sensitive to red, green, or blue light.
•Equal stimulation of all = white perception.
3.Fovea:
•Central part of retina; high cone concentration, no rods.
•Used for detailed vision when focusing closely.
•Only ~2° of the visual field falls on fovea at once.
•Eye makes constant scanning movements to build a complete image.
4.Night Vision:
•Rods function when cones are not stimulated (low light).
•Night images appear in shades of grey, not colour.

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