Understanding sight (vision) – how the five senses work
From the book – Chapter 19: How Five Senses Actually Work
Sight (vision)
How it works
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Light enters the eye through the cornea and pupil.
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The lens focuses light onto the retina at the back of the eye.
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Photoreceptors activate: rods detect light and dark and work in low light; cones detect colour (red, green, blue) and work in bright light.
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Retinal cells convert light to electrical signals.
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The optic nerve carries signals to the brain.
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Visual cortex (occipital lobe) processes the information into images.
Key structures: cornea, pupil, lens, retina, optic nerve; occipital lobe.
Mental health connection
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Vision loss can lead to depression, anxiety, isolation.
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Seasonal changes in light affect mood (Seasonal Affective Disorder).
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Visual hallucinations can occur in certain psychiatric conditions.
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Eye contact and facial recognition are important for social connection.
Read the full chapter – Chapter 19: How Five Senses Actually Work
Stories from real life
- The Grandfather Who Stopped Coming to the Table – Raghunath Kulkarni, seventy-one, used to be the loudest voice at the family dinner in Nashik. He argued about cricket, teased his grandchildren and told the same…
- The Dark Months in Helsinki – Aino Virtanen was twenty-three when she moved from Chennai to Helsinki for her master's degree. September was beautiful. By November the sun rose late and set…
- Mihir and the Scratchy Shirt – Mihir, seven, cried every morning about his school uniform. 'It scratches! The tag is stabbing me!' His parents in Ahmedabad thought he was making excuses to…
- Leela, Age 41 – Two years after surviving a terrifying kitchen fire, forty-one-year-old Leela realised something strange was happening to her nervous system. Whenever she encountered the smell of a…
Shloks
- Bhagavad Gita 15.9 – Presiding over ear, eye, touch, taste and smell, and over the mind, the person enjoys the objects.
More on this topic: The brain, hormones and body chemistry behind your moods
More questions
- How it works? (Chapter 19)
- Mental health connection – sight (vision)
- Understanding hearing (auditory) – how the five senses work
- How it works? (Chapter 19)
- Mental health connection – hearing (auditory)
- Understanding smell (olfactory) – how the five senses work
- How it works? (Chapter 19)
- Mental health connection – smell (olfactory)
- Understanding taste (gustatory) – how the five senses work
- How it works? (Chapter 19)