Dynamic Ret Flashcards

1
Q

what is the main purpose of dynamic retinoscopy

A

Measure the magnitude of accommodative response

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2
Q

if point conjugate with retina is at 40cm, a DR performing ret at 67 cm will see ?

A

ATR
pc is between patient and retinoscope

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3
Q

if point conjugate with retina is at 40cm, a DR performing ret at 33cm will see

A

WTR
ps is behind the retinoscope

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4
Q

the reciprocal of the distance from the retinoscope to the eye is equal to

A

the accommodative response in diopters

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5
Q

the reciprocal of the target distance of patient is equal to

A

stimulus to accommodate (D)

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6
Q

for cross nott retinoscopy the patient is ____ behind the phoropter

A

corrected

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7
Q

stimulus to accommodate equation says

A

AS = required F - unaccom F

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8
Q

accom response equation says

A

accomm response = accom F - unaccom F

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9
Q

required power is

A

theoretical power needed to focus target on retina

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10
Q

accomm power is

A

the actual amount the eye does increase its power by

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11
Q

the accom response is measured by

A

the retinoscope position (neutral reflex observed) of any uncorrected error

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12
Q

bells retinoscopy is

A

when the retinoscope distance is stable, target moved closer to pt

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13
Q

sheared retinoscopy is

A

when both target and retinoscope is fixated at the same location

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14
Q

what is low dynamic neutral

A

the lowest lens that gives a neutral reflex

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15
Q

low dynamic neutral equals

A

accommodative error

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16
Q

high dynamic neutral is

A

highest lens giving neutral

17
Q

negative relative accomm is

A

ability to relax accomm while maintaining convergence on a target

18
Q

NRA equations says

A

NRA = HDN - LDN

19
Q

What is positive relative accomm (PRA) ?

A

ability to increase accom while maintaining convergence on a target

20
Q

what is the reaction time of monocular estimate method ?

A

350 ms

21
Q

Is mohnidra’s near ret a type of dynamic ret? what does it access

A

no
measures distance refractive error