1 Vision

2 Segments Chambers Humors Slide 1

3 Tunics 1. Fibrous Tunic  Cornea  Sclera 2. Vascular Tunic  Choroid  Ciliary body  iris Slide 2

4 3. Sensory Tunic  Retina  Pigmented layer  Nervous layer  Rods  Cones  Bipolar  Horizontal  Amacrine  Ganglion Slide 3

5 Light refraction Lens Accommodation Disorders: Myopia Hyperopia Presbyopia Astigmatism Slide 4

6 Excitation of photoreceptors PhotoreceptionPhotopigments Opsins and Retinal Opsins and RetinalRods Cones (b,r,g) Slide 5

7 How photopigments respond to light. Slide 6

8 Release of neurotransmitter by photoreceptors Slide 7

9 Pathway to the brain Ganglia Optic Nerve Optic Chiasma Optic Tracts Optic Radiation Slide 8

16.14 What is lacrimal fluid and what are its functions? Why does your nose run when you cry? What are the components of the fibrous tunic and vascular tunic? Which part of the retina produces the sharpest vision when light falls on it? What is the function of the aqueous humor? The vitreous body/humor? What is refraction? Which components of the eye are primarily responsible for refracting light? If you look at the horizon to determine where you are, then look down to read a map, what process must your eyes accomplish to keep your vision focused? How do photopigments respond to light and recover in the dark? Why does a decreased release of glutamate by photoreceptors generate a receptor potential in bipolar cells? 10