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29 Cards in this Set
- Front
- Back
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What for things that must be tested for in infants?
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1- Focus at near
2- alignment 3- acuity 4- refractive error |
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How would you test focus at near in an infant?
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1-dynamic ret
2- photoscreening |
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How would you test alignment in an infant?
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1- cover test
2- corneal light reflex 3- bruckner |
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HOw would you test acuity in an infant?
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1- teller cards
2- fix and follow 3- objection to cover |
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How would you test refractive error in an infant?
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1- ret after cycloplegia
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What would you use to cycloplege an infant?
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0.5% cyclo and 1.0% tropicamide
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What is the normal range of refractive errors for a 6 month old?
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about -1.00 to +6.00
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When does emmetropization usually stop occurring?
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at 12 months
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T or F: the eye stops growing when clear vision is obtained.
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true therefor full plus can halt ocular growth prematurely and cause permanent refractive error.
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Higher hyperopia normalizes _____. (faster/slower)
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faster (paradox)
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What drugs would you use to cyclopledge a toddler? how wany drops would you use?
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1.0% cyclo + 1.0%T
1-2 drops |
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What are Atkinson's rules for prescribing plus to infants?
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1- 1/2 the cyl
2- adjust the sphere by 1/2 of the deducted cyl 3- remove a final 1.5-2.0 D form this sphere to allow residual hyperopia in the normal range |
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Do Atkinson's rules apply if the infant has ambyopia?
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NO!!!!
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T or F: if the baby has marked development delays due to vision, you can Rx immediately.
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True (even if the refractive error is within normal limits)
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Only the _____ component of the prescription can change the axial length of the eye.
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spherical!!
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Changes in astigmatism result from the ___ and ___, therefore, this change is not visually guided.
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cornea and lens
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What is the age cut-off for atkinson's rules?
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3 years old
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What would you prescribe if an ET develops suddenly?
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full plus
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At 12 months of age, > _____ of anisometropia is uncommon.
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1 D
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Knapp says the best correction for axial ametropes is ______.
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spectacles
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Knapp says best correction for refractive ametropes is ___.
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Contact lens
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Knapp says best correction for refractive ametropes is ___.
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Contact lens
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At a difference of ____% mag b/t the eyes the VA goes down.
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5%
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When fitting iseikonic lenses--were the glasses very close to the eyes (decreasing vertex distance) will _____ (increase/decrease) the mag.
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decrease!
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When you decrease the vertex distance from 15mm to 10mm you will decrease the mag to __%.
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4%
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Mag = __x___.
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shape factor x power factor
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M(shape) = _______?
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= 1/ (1 - (1/n)D)
D= front surface curve |
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M(power) = ________
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= 1/ (1-Dh)
D= lens power h= vertex distance in meters |
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What is the only varible in the power factor portion of the Mag equation that you can alter.
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vertex distance. You cant change the Rx (D)!!!
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