Vision I Flashcards

1
Q

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

A
  1. Converge

2. Disperse

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2
Q

Fxnl parts of Photoreceptors

A

Outer:
- Outer segment

  • Inner Segment

Inner:
- Nucleus

  • Synaptic body
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3
Q

Refractive power is measured in _____.

A

Diopters

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4
Q

Avg. diameter of a CONE in the retina?

A

1.5 micrometers

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5
Q

Synaptic Body

A

Connects with the HORIZONTAL & BIPOLAR Cells

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6
Q

How is Rhodopsin Formed?

A

Scotopsin + 11-Cis Retinal

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7
Q

Purpose of a tonometer

A

Used to measure INTRA-OCULAR pressure

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8
Q

Hyperopia

A
  • Farsightedness

- SHORT Eyeball

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9
Q

What happens to Rhodopsin when exposed to light?

A

It begins to decompose

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10
Q

Refractive Index

A

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

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11
Q

Inner Segment

A

Contains Organelles

  • Especially MITOCHONDRIA
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12
Q

Myopia

A
  • Nearsightedness

- LONG eyeball

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13
Q

Focal point

A
  • The point through which ALL Parallel rays of light will pass
  • After passing through each part of the lens
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14
Q

Refractive Power

A

A measure of how much a LENS bends light waves

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15
Q

1 diopter equals what?

A

1 meter/ FOCAL length of a lens

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16
Q

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

A
  1. -40 mV rather than -75

2. Due to LEAKY channels

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17
Q

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

18
Q

Hyperopia can be fixed with what kind of lens?

A

Con-CAVE Lenses

19
Q

Canal of Schlemm

A

Where aqueous fluid flows in from the Ant. Chamber

20
Q

Outer Segment

A

Site of light sensitive Photo-Chemicals

21
Q

Focal length

A

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

22
Q

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

A

(Resolving Power)

1.5 - 2 micrometers

23
Q

Normal Intra-ocular pressure is what?

24
Q

Refraction

A

Bending of light waves at an ANGULATED surface of transparent Material

25
What catalyzes the rxn from cGMP -> 5’GMP?
cGMP Phosphodiesterase
26
Refraction Index of Air
1.0
27
The relationship b/w Depth of focus and pupillary diameter
INVERSELY Proportional
28
Total refractive power of the eye
59 Diopters
29
The Aqueous humor is is formed by what?
Ciliary Processes
30
What happens to objects that are projected onto the retina?
They will be REVERSED and INVERTED
31
Function of the Iris
Controls the amount of LIGHT entering the eye
32
Myopia can be fixed with what kind of lens?
Con-VEX lenses
33
Can light be refracted if striking PERPENDICULAR to the Surface?
No it continues through W/O Bending
34
Photosensitive pigments in Rods
Rhodopsin
35
Photosensitive Pigments in Cones
3 different color pigments - Blue - Green - Red
36
Emmetropia
The NORMAL eye - Normal Depth of FOCUS
37
The degree of refraction depends on what?
- 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
38
Cones are similar to rods except that the Protein portions are what?
Rods - Use Scotopsin Cones - Use OPSIN
39
Visual Acuity
Measure of the resolving power of the eye
40
Total Refractive power of the eye
59 Diopters