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18 Cards in this Set
- Front
- Back
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what is the primary method to objectivly determine a patients refractive error?
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Retinoscopy
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Name some clinical uses for retinoscopy.
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starting point for refraction,compare with subjective refraction,clues for difficult refractions, good for non-verbal patients,cuts down time for refraction
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static streak retinoscopy...
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determines the refractive error of the eye relative to the point of fixation
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If the retinoscope sleeve is down it is in
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Plano
(Light beam is divergent) |
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If the retinoscope sleeve is up it is in
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concave
(light beam is convergent) |
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If the patient is a moderate to high myope where is the far point?
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between the clinician and the patient
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If the patient is a low myope where is the far point?
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behind the clinicians head
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If the patient is an emmetrope where is the far point?
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infinity
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If teh patient is a hyperope where is the far point?
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behind the patients head
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What about the far point for astigmatism?
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there are 2 90 degrees apart
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Static Retinoscopy
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Clinician stays in one place while adding lenses to neutralize the refractive error.
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Dynamic Retinoscopy
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Clinican move the retinoscope in or out to find neutrality
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If you get with motion where could your far point be?
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-behind clinician (low myope, less than your working distance)
-behind patients retina (hyperope) add PLUS! |
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If you get against motion where is your far point?
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far point is between the clinician and the patient
ADD MINUS |
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When you neutralize the reflex in retinoscopy where is the far point?
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At the retinoscope. created a myope equal to your working distance.
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When finding neutrality if there is a range should you go with the more plus or the more minus lens?
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more plus. "high neutral" it is good to come from plus.
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6 charactaristics of the reflex that can be used to indicate the refractive status of the eye
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brightness, direction, speed width, definition, alignment
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What are scissors and how can you deal with them?
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When the refractive error is different in different parts of the eye.
Turn the lights up to constrict the pupil, neutralize the central reflex. |
