Dynamic Ret Flashcards
(21 cards)
what is the main purpose of dynamic retinoscopy
Measure the magnitude of accommodative response
if point conjugate with retina is at 40cm, a DR performing ret at 67 cm will see ?
ATR
pc is between patient and retinoscope
if point conjugate with retina is at 40cm, a DR performing ret at 33cm will see
WTR
ps is behind the retinoscope
the reciprocal of the distance from the retinoscope to the eye is equal to
the accommodative response in diopters
the reciprocal of the target distance of patient is equal to
stimulus to accommodate (D)
for cross nott retinoscopy the patient is ____ behind the phoropter
corrected
stimulus to accommodate equation says
AS = required F - unaccom F
accom response equation says
accomm response = accom F - unaccom F
required power is
theoretical power needed to focus target on retina
accomm power is
the actual amount the eye does increase its power by
the accom response is measured by
the retinoscope position (neutral reflex observed) of any uncorrected error
bells retinoscopy is
when the retinoscope distance is stable, target moved closer to pt
sheared retinoscopy is
when both target and retinoscope is fixated at the same location
what is low dynamic neutral
the lowest lens that gives a neutral reflex
low dynamic neutral equals
accommodative error
high dynamic neutral is
highest lens giving neutral
negative relative accomm is
ability to relax accomm while maintaining convergence on a target
NRA equations says
NRA = HDN - LDN
What is positive relative accomm (PRA) ?
ability to increase accom while maintaining convergence on a target
what is the reaction time of monocular estimate method ?
350 ms
Is mohnidra’s near ret a type of dynamic ret? what does it access
no
measures distance refractive error
