Vision I

Question 1

A CONVEX lens will _____ light while a CONCAVE lens will ______ light.

Answer 1

1. Converge

2. Disperse

Question 2

Fxnl parts of Photoreceptors

Answer 2

Outer:
- Outer segment

• Inner Segment

Inner:
- Nucleus

• Synaptic body

Question 3

Refractive power is measured in _____.

Answer 3

Diopters

Question 4

Avg. diameter of a CONE in the retina?

Answer 4

1.5 micrometers

Question 5

Synaptic Body

Answer 5

Connects with the HORIZONTAL & BIPOLAR Cells

Question 6

How is Rhodopsin Formed?

Answer 6

Scotopsin + 11-Cis Retinal

Question 7

Purpose of a tonometer

Answer 7

Used to measure INTRA-OCULAR pressure

Question 8

Hyperopia

Answer 8

• Farsightedness

- SHORT Eyeball

Question 9

What happens to Rhodopsin when exposed to light?

Answer 9

It begins to decompose

Question 10

Refractive Index

Answer 10

The Ratio of the velocity of light in air traveling through a substance

Question 11

Inner Segment

Answer 11

Contains Organelles

• Especially MITOCHONDRIA

Question 12

Myopia

Answer 12

• Nearsightedness

- LONG eyeball

Question 13

Focal point

Answer 13

• The point through which ALL Parallel rays of light will pass
• After passing through each part of the lens

Question 14

Refractive Power

Answer 14

A measure of how much a LENS bends light waves

Question 15

1 diopter equals what?

Answer 15

1 meter/ FOCAL length of a lens

Question 16

In Dark conditions, what is the electro negativity inside the Outer segment? Why?

Answer 16

1. -40 mV rather than -75

2. Due to LEAKY channels

Question 17

B/w Rods and Cones, which one is more sensitive to the DARK?

Answer 17

Rods

Question 18

Hyperopia can be fixed with what kind of lens?

Answer 18

Con-CAVE Lenses

Question 19

Canal of Schlemm

Answer 19

Where aqueous fluid flows in from the Ant. Chamber

Question 20

Outer Segment

Answer 20

Site of light sensitive Photo-Chemicals

Question 21

Focal length

Answer 21

The distance from the Center of the Lens to the focal point

Question 22

Max. VA for 2-point sources of light is what?

Answer 22

(Resolving Power)

1.5 - 2 micrometers

Question 23

Normal Intra-ocular pressure is what?

Answer 23

15 mmHg

Question 24

Refraction

Answer 24

Bending of light waves at an ANGULATED surface of transparent Material

Question 25

What catalyzes the rxn from cGMP -> 5’GMP?

Answer 25

cGMP Phosphodiesterase

Question 26

Refraction Index of Air

Answer 26

1.0

Question 27

The relationship b/w Depth of focus and pupillary diameter

Answer 27

INVERSELY Proportional

Question 28

Total refractive power of the eye

Answer 28

59 Diopters

Question 29

The Aqueous humor is is formed by what?

Answer 29

Ciliary Processes

Question 30

What happens to objects that are projected onto the retina?

Answer 30

They will be REVERSED and INVERTED

Question 31

Function of the Iris

Answer 31

Controls the amount of LIGHT entering the eye

Question 32

Myopia can be fixed with what kind of lens?

Answer 32

Con-VEX lenses

Question 33

Can light be refracted if striking PERPENDICULAR to the Surface?

Answer 33

No it continues through W/O Bending

Question 34

Photosensitive pigments in Rods

Answer 34

Rhodopsin

Question 35

Photosensitive Pigments in Cones

Answer 35

3 different color pigments

• Blue
• Green
• Red

Question 36

Emmetropia

Answer 36

The NORMAL eye

• Normal Depth of FOCUS

Question 37

The degree of refraction depends on what?

Answer 37

• The RATIO of the 2 Refractive indices of the 2 transparent media
• The Degree of Angulation b/w the Interface and the entering wave front

Question 38

Cones are similar to rods except that the Protein portions are what?

Answer 38

Rods
- Use Scotopsin

Cones
- Use OPSIN

Question 39

Visual Acuity

Answer 39

Measure of the resolving power of the eye

Question 40

Total Refractive power of the eye

Answer 40

59 Diopters