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Video Title / CaptionPDF Download FREE AND STUDY GAMES ABOUT KERATOMETRY EXAM QUESTIONS Actual Qs and Ans Expert-Verified Explanation This Exam contains: -Guarantee passing score -28 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Define Keratometry Answer: it means literally "measurement of the eye" Question 2: How should measurements be gotten in the case of irregular astigmats? Answer: For quantitative evaluation for irregular astigmatism corneal topography is used Question 3: Define Oblique astigmatism Answer: The principle meridian with the greatest curvature is greater than 30 degrees from either 180 or 090 Question 4: What are 8 sources of error in keratometry Answer: 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) Question 5: Define ATR astigmatism Answer: The principle meridian with the greatest curvature (and power) is horizontal or X090 Question 6: Define irregular astigmatism Answer: The principle meridians are not 90 degrees apart (note that this has no bearing on WTR or ATR classifications) Question 7: What is Javal's formula for ETA? Answer: 1.25dK + (-0.50X090) Question 8: Name 4 types of instruments that can be used to perform keratometry Answer: 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 Question 9: How could one measure the periphery of the cornea? Answer: Using a corneal topographer and unicorns Question 10: Give four features of recordings of keratometry findings Answer: 1.Horizontal meridian recorded first, vert second 2.recorded as power (not radius) found @ the measured meridian (not axis) 3.Recorded to the nearest .12D using three digits for the meridian 4.comment on mire quality if not clear and regular Question 11: What does a keratometer measure? Answer: The radius of curvature of the central cornea's anterior surface. Question 12: How is posterior corneal curvature figured into Javal's rule? Answer: It isn't. Posterior corneal curvature usually does not significantly contribute to total toricity. Question 13: What is the ETA of an oblique astigmat? Answer: just: 1.25dK Question 14: Define WTR astigmatism Answer: The principle meridian with the greatest curvature (and power) is vertical or x180 Question 15: Define regular astigmatism Answer: the principle meridians are 90 degrees apart (note that this has no bearing on WTR or ATR classifications) Question 16: What are four clinical uses for keratometry? Answer: 1.for refractive ETA & axis of astig 2.contact lens evaluations 3.assmsnt of opticl intgrty(qulty of cornea&tear flm) 4.diagnosis/eval of progressve optcl condtns (kertoconus) Question 17: What area of the cornea is measured in keratometry? Answer: 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 Question 18: What is the average K reading Answer: 43.00 to 44.00 Question 19: What type of procedure is keratometry? Answer: an objective refractive assessment technique in which refractive status is determined w/o input from the patient Question 20: How is keratometry used in contact lens evaluations? Answer: https://www.learnexams.com/study-content/free-and-study-games-about-keratometry-exam-49246
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PDF Download FREE AND STUDY GAMES ABOUT KERATOMETRY EXAM QUESTIONS Actual Qs and Ans Expert-Verified Explanation This Exam contains: -Guarantee passing score -28 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Define Keratometry Answer: it means literally "measurement of the eye" Question 2: How should measurements be gotten in the case of irregular astigmats? Answer: For quantitative evaluation for irregular astigmatism corneal topography is used Question 3: Define Oblique astigmatism Answer: The principle meridian with the greatest curvature is greater than 30 degrees from either 180 or 090 Question 4: What are 8 sources of error in keratometry Answer: 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) Question 5: Define ATR astigmatism Answer: The principle meridian with the greatest curvature (and power) is horizontal or X090 Question 6: Define irregular astigmatism Answer: The principle meridians are not 90 degrees apart (note that this has no bearing on WTR or ATR classifications) Question 7: What is Javal's formula for ETA? Answer: 1.25dK + (-0.50X090) Question 8: Name 4 types of instruments that can be used to perform keratometry Answer: 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 Question 9: How could one measure the periphery of the cornea? Answer: Using a corneal topographer and unicorns Question 10: Give four features of recordings of keratometry findings Answer: 1.Horizontal meridian recorded first, vert second 2.recorded as power (not radius) found @ the measured meridian (not axis) 3.Recorded to the nearest .12D using three digits for the meridian 4.comment on mire quality if not clear and regular Question 11: What does a keratometer measure? Answer: The radius of curvature of the central cornea's anterior surface. Question 12: How is posterior corneal curvature figured into Javal's rule? Answer: It isn't. Posterior corneal curvature usually does not significantly contribute to total toricity. Question 13: What is the ETA of an oblique astigmat? Answer: just: 1.25dK Question 14: Define WTR astigmatism Answer: The principle meridian with the greatest curvature (and power) is vertical or x180 Question 15: Define regular astigmatism Answer: the principle meridians are 90 degrees apart (note that this has no bearing on WTR or ATR classifications) Question 16: What are four clinical uses for keratometry? Answer: 1.for refractive ETA & axis of astig 2.contact lens evaluations 3.assmsnt of opticl intgrty(qulty of cornea&tear flm) 4.diagnosis/eval of progressve optcl condtns (kertoconus) Question 17: What area of the cornea is measured in keratometry? Answer: 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 Question 18: What is the average K reading Answer: 43.00 to 44.00 Question 19: What type of procedure is keratometry? Answer: an objective refractive assessment technique in which refractive status is determined w/o input from the patient Question 20: How is keratometry used in contact lens evaluations? Answer: https://www.learnexams.com/study-content/free-and-study-games-about-keratometry-exam-49246

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