Procedures 1 Spring 2010
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | an objective refractive assessment technique in which refractive status is determined w/o input from the patient
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| Define Keratometry | show 🗑
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| What is an alternative name for keratometry? | show 🗑
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| show | The radius of curvature of the central cornea's anterior surface.
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| show | 1.Keratoscope (illuminated placido's disk) 2.2-position keratometers(the original manual models) 3.One-position keratometers(the most commonly used manual model & the ones that we use) 4.automated keratometers
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| How does (broadly) a keratometer work? | show 🗑
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| show | 1.the mire is NOT reflected of the exact center of cornea 2.reflctd from 2 small areas on either side of the axis of the instrument 3.reduem of curvature is measured from this small area about 3mm in diameter
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| show | Using a corneal topographer and unicorns
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| show | The 2 meridians of greatest & least curvature
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| show | the principle meridians are 90 degrees apart (note that this has no bearing on WTR or ATR classifications)
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| Define irregular astigmatism | show 🗑
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| show | The principle meridian with the greatest curvature (and power) is vertical or x180
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| Define ATR astigmatism | show 🗑
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| Define Oblique astigmatism | show 🗑
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| Give four features of recordings of keratometry findings | show 🗑
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| How should measurements be gotten in the case of irregular astigmats? | show 🗑
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| show | 1.spectacle lens effectvty of 13mm is not considred 2.K's only measure the ant corneal surface 3.the back of the cornea can also be toric leading to internal astigmtsm 4.does not figure in lenticular astgmtsm due to natrl tlting of lens
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| What does the -0.50x090 used in Javal's rule account for? | show 🗑
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| show | It isn't. Posterior corneal curvature usually does not significantly contribute to total toricity.
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| What is Javal's formula for ETA? | show 🗑
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| What is the ETA of an oblique astigmat? | show 🗑
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| What is the average K reading | show 🗑
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| show | 1.The two eyes have different refractive powers 2.One eye is myopic and the other is hyperopic
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| What are four clinical uses for keratometry? | show 🗑
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| When is using keratometry to find ETA particularly useful? | show 🗑
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| show | 1.msrmnt of crvtr for fittng contcts 2.montring corneal damg secndry to contct wear 3.msrmnt of flexure of RGP's on eye 4.msrmnt of radius of crvtr of both soft & RGP's
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| When is keratomerty usually done (on which patients)? | show 🗑
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| show | 1.imprpr calibration 2.imprprly focsed eye pc 3.faulty postning of patnt 4.lack of prpr fixatn by patnt 5.rdcd VA of examner 6.accmdtv fluctuation of examner 7.loclized corneal dstrtions 8.imprpr focusng of mires(espclly vertical)
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Created by:
mm_coady