Vision

Question 1

What is macular degeneration?

Answer 1

progressive age- related loss of central vision.

Question 2

How can Presbyopia be corrected?

Answer 2

by using convex lenses for near-vision or Incase of myopia, using bifocal lens.

Question 3

Accommodation is achieved by?

Answer 3

contraction of the ciliary muscle, reducing tension in the zonule fibers. Hence permitting the lens elasticity to increase its curvature for accommodation.

Question 4

The disorder in which high levels of intraocular pressure reduces blood supply to the
eye causing retinal damage is called——–?

Answer 4

Glaucoma

Question 5

What are the five basic neuronal layers in the retina?

Answer 5

photoreceptors, bipolar cells, ganglion cells, horizontal

cells, and amacrine cells.

Question 6

What are photoreceptors?

Answer 6

Outer segment contains light-sensitive pigments and inner segment contains nucleus and synaptic terminals to bipolar and horizontal cells. 2 types - Rod and Cones.

Question 7

Cascade of events following activation of photoreceptor is called ———?

Answer 7

Phototransduction

Question 8

what is Rhodopsin?

Answer 8

Photopigment in Rods

Question 9

Changes in opsin lead to the activation

of an intracellular messenger known as?

Answer 9

Transducin

Question 10

The complex process involving the restoring retinal layers to a state where it is capable of signaling light- photon capture known as

Answer 10

Retinoid Cycle