To memorise Flashcards

1
Q

What do radiant flux and luminous flux describe?

A

Amount of light emitted from a source

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2
Q

Units for radiant flux and luminous flux

A

Radiant flux: Watts

Luminous flux: Lumens

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3
Q

What is the peak photopic sensitivity of the eye?

A

555nm

Luminous efficiency of the eye is maximal at this wavelength - 1 watt = 685 lumens

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4
Q

What do radiant intensity and luminous intensity describe?

A

Intensity of light emitted from a source (amount of light per solid angle of space)

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5
Q

Units for radiant intensity and luminous intensity

A

Radiant intensity: watts per steradian

Luminous intensity: lumens per steradian = candelas

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6
Q

What do irradiance and illuminance describe?

A

Amount of light falling on a surface

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7
Q

Units for irradiance and illuminance

A

Irradiance: watts per sq metre
Illuminance: lumens per sq metre = lux

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8
Q

What is 1 steradian?

A

Unit for solid angle (cone shape)

Angle at the centre of a sphere which subtends an area on its surface that measures the square of its radius

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9
Q

What is one candela and how is a lumen derived from this?

A

One candela
= 1/60 of intensity radiated by a black body radiator at freezing point of platinum per sq cm
= 1 lumen per steradian

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10
Q

What do radiance and luminance describe?

A

Intensity of light reflected from a surface

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11
Q

Units for radiance and luminance

A

Radiance: watts/steradian per sq metre
Luminance:
- Candelas per sq metre
- Apostilbs (= 1/pi candelas / sq metre)

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12
Q

What is a troland?

A

Retina specific measure of illumination.

1 troland = retinal illumination when a surface luminance of 1 candela / sq metre is viewed through an entrance pupil which measures 1 mm2 after correction for Stiles-Crawford effect

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13
Q

Direct gonioscopy principle

A

Direct gonio contact lens has higher critical angle than cornea-air interface, allowing rays from the angle to exit via the goniolens –> real erect image
Space between cornea and lens is filled with viscous fluid

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14
Q

Direct goniolenses

A

Koeppe
Barkan
Swan-Jacob

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15
Q

Indirect gonioscopy principle

A

Indirect goniolens uses a mirror or prism to reflect rays from the angle
Inverted virtual image formed

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16
Q

Indirect goniolenses

A

Goldmann 3-mirror
Zeiss
Posner
Sussman

17
Q

p-ANCA: what does it stand for?

A

Perinuclear anti-neutrophil cytoplasmic antibodies.

Stains myeloperoxidase

18
Q

c-ANCA: what does it stand for?

A

Cytoplasmic ANCA

Stains proteinase 3

19
Q

What is angular magnification?

A

D/4, where D is the power of the lens used

20
Q

Iris / ciliary body development: what gestational age?

A

Week 12

Hox gene marks precursors

21
Q

Lens development gestational age

22
Q

Trabecular meshwork / aqueous humour formation gestational age

23
Q

When dods the hyalpid artery regress?

24
Q

PAX6 chromosome

25
Rb chromosome
13
26
Suxamethonium MoA
Depolarising NMJ blockade
27
What is one apostilb?
Measure of luminance. | 1 lumen / m2 or 1/pi candelas / m2
28
Holding a lens of unknown power over a cross on a page - with and against movement
Minus lens: cross moves with direction of movement | Plus lens: cross moves against direction of movement
29
What does the cavity of the optic vesicle become?
The subretinal space
30
When does the lens vesicle separate from the surface ectoderm?
33 days