The Human Eye
Anatomy
How does the eye work?
The eye acts like a converging lens by producing a small, inverted and real image on the retina. The shape of the lens on the eyeball will change, this changes the length of the lens and allows focus on the retina.
Rods vs Cones
Rods: Responsible for detecting light intensity
Cones: Responsible for detecting colours
Eye disorders and solutions
Glaucoma
Symptoms: Intense pain, red eye, cloudy cornea
Solutions: Eye drops, pills, surgery
Damage to the optic nerve and increased pressure in the eye
Cataracts
An opaque, cloudy area that develops in the clear lens. It gradually blocks or distorts the light reducing visions
Causes: Eye injuries or infections, diabetes, drugs, genetics
Solution: Surgery where an intraocular lens is implemented
Astigmatism
The cornea is not smooth, therefore the rays of light entering the eye do not focus properly
Solution: Laser eye surgery
Myopia
When the distance between the lens and retina is too large. Image focuses in front of the retina
click to edit
Solution: Can be fixed with a diverging concave lens
Hyperopia
When the distance between the lens and the retina is too small. Image focuses in front of the retina
Solution: Can be fixed with a diverging concave lens
Presbyopia
The gradual loss of your eyes ability to of focus on nearby objects
Solutions: Glasses or contact lenses
Symptom: Difficulty seeing far away objects
Symptom: Difficulty seeing close objects
Symptoms: Blurred and distorted vision, eyestrain, headaches
Symptoms: Blurred vision at a normal viewing distance, eyestrain or headaches after reading