_______________ of eyes orient their visual axis toward object
Retina converts light energy into ______________
Dilation of pupils occurs
-in the dark, rhodospin of rods is regenerated
-In 1 to 2 minutes, night(scotopic) vision begins to function
-After 20 to 30 minutes, amount of regenerated rhodospin is sufficient for eyes to reach maximum sensitivity
_______________ of lens
Changes in the curvature of the lens that enables you to focus on nearby objects
-Ciliary muscle contracts>>>suspensory ligaments slacken>>>lens bulges and becomes more convex(thicker)
-light refracted more strongly and focused on retina
Rods and cones- absorb light and generate a chemical or electrical signal
Dendrites synapse with rods/cones and axons synapse with ganglion cells>>>serve as a bridge from photoreceptors to ganglion cells
Pupil constriction reduces light intensity(and any discomfort that may accompany sudden brightness)
-Color vision and acuity below normal for 5 to 10 min
-Time needed for pigment bleaching to adjust retinal sensitivity to high light intensity
-Rods quickly bleach and become nonfunctional; cones take over
Verticales
Day vision
color vision
visual pigment=photopsin
Fovea contains only 4,000 cone cells, on neuronal convergence>>> Each foveal cone cell has "private" to brain
-high resolution color vision
Of retina (form rear forward) Photoreceptor cells(rods and cones), bipolar cells, ganglion cells
largest neurons in the retina
-arranged in a single layer next to the vitreous body
-axons form optic nerve (CN 2)
Most posterior part of retina.
Absorbs stray light so visual image is not degraded
_______________ of pupil
Blocks peripheral light rays and reduces spherical aberration (blurry edges)
Night vision
Monochromatic(gray) vision
visual pigment=rhodopsin
External neuronal convergence- 600 rods converge on one bipolar cell
Motion detection and peripheral vision
-low resolution system only
-Cannot resolve finely detailed images
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It prints on two pages.
Big puzzles won’t always print on one page — the clues and grid are the smallest we could make them while keeping them readable for everyone.
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