Copy of the eye structure
Nicholas Reynolds
Created on February 1, 2024
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Transcript
Vision & The Eye
Anatomy, Physiology and How we see
Learning Objectives
- Explain how the eye works to see the world around us
- Describe the anatomy of the eye & Label Diagrams
Vision involves the eye and the brain.
Vision is your ability to see.
The eye gathers pictures and sends them to the brain.
The eye is made of the iris and the pupil.
The eye is one of your sense organs.
The Eye
Pupil
Iris
The pupil becomes larger and smaller as it controls the light coming into the eye.
The black part of the eye is the pupil.
The colored part of the eye is the iris.
The Parts of the Eye
- Smooth radial muscles
- Circular muscles
- These surround a hole – the pupil
Iris and Pupil
- muscle in the iris contracts making the pupil smaller in bright light
- different muscle in the iris contract to make the pupil larger in dim light
Changing the size of the pupils
- Sclera
- Retina
- Cornea
- Iris
- Pupil
- lens
- Suspensory ligaments
- Ciliary muscle
- Refract
- Focus
Key terms
- Suspensory ligaments
- Ciliary muscle
- Refract
- Focus
- Lens
- Sclera
- Retina
- Cornea
- Iris
- Pupil
Structure of the eye
Sensory neurone Blind spot (no rods and cones)
Surrounds the cornea, lubricated by watery tear fluid
Conjunctivia
Transparent part of the sclera, Allows light to enter the eye.
Light sensitive rod and cone cells
Tough and fibrous
Blood vessels
- There are two lenses in your eye, the cornea and the eyelens.
- The cornea, the front surface of the eye, does most of the focusing in your eye
- The eyelens provides adjustable fine-tuning of the focus
Retina
Eyelens
Cornea
Structure of the Eye: Cornea and Lens
- Light is refracted when it enters the eye
- Cornea
- Front of Lens
- Rear of Lens
- Image forms on retina
Refract (bend)
Blind Spot
Lens held in place by suspensory ligamentsSuspensory ligaments are attached to ciliary ,muscle
- Ciliary Muscles relax
- Suspensory ligaments pulled taught
- Lens pulled thin
- Light rays enter at a less acute angle
- less bending power, longer focal length
Looking at a distant object
- Ciliary muscles contract
- Suspensory ligaments loosen
- Lens bulges
- Light rays enter at a more acute angle
- bending power Is more
- Shorter focal length
Looking at a close object
Accomodation
long sighted (hyperopia)- the focal point is too long Distant image will be clear
Short sighted (myopia)- the focal point falls short. Near image will be clear
Short and long sighted
Correction
Optics of the Human Eye