5 - Retina & Eye Disorders (9.5.25)

The Retina & Eye Disorders

PBSI 3209.5.25

Slido of the day

If you could see any electromagnetic radiation outside the visible light spectrum, which would you choose?

Announcements

• Quiz 1 will be live tonight (covers Ch. 2 - Light & the Eyes)
• We will circle back to signal detection theory

EYE Anatomy with CRASH COURSE

The Retina: where light is transduced into neural signals

click to see a 3D rendering of the cells of the retina

Retinal image - an inverted 2-D image of the current field of view

Lennart Nilsson

Neurons of the Retina

There are 2 Types of Photoreceptors: Rods & Cones

• cones - photoreceptors that detect differences in wavelength (color)
• 3 types (S, M, & L) sensitive to specific color ranges

• rods - photoreceptors that detect differences in light intensity
• most sensitive at 500 nm

WHat can go wrong?

• Some common age-related disorders:
1. refractive errors
2. macular degeneration
3. glaucoma
4. cataracts

See how the world looks with various eye disorders

1. Refractive errors

• the eye's shape prevents light from focusing properly on the retina
• results in blurry vision

click to see video explanation of refractive errors

2. Age-Related Macular degeneration (AMD)

• the center of the retina (macula) starts to break down

2. Age-Related Macular degeneration (AMD): Wet & Dry

3. Glaucoma

• treated with drugs that work on the adrenaline system

• excessive intraocular pressure causes damage to the optic nerve

click to see an animation of glaucoma

4. Cataracts

• requires replacement with intraocular lens (IOL)

• a thickening & clouding of the crystalline lens

click to see how a cataract surgery is done

Remember to complete your Exit Ticket

Exit Ticket

Next class: Vision in the Brain

Movie rec of the week