NCLE Test Questions and answers with complete solution

Assessment of the quality of the peripheral curves (blends of a rigid contact lens) is achieved by the use of the- a. profile analyzer b. shadow graph c. keratometer d. burton light - ANSWER a. profile analyzer Contact lens power should be specified in- a. back vertex power b. sphero-cylinder power c. power in situ d. posterior apical radius - ANSWER a. back vertex power The slit-lamp illumination that gives an overall view of the cornea but limits detail is- a. sclerotic scatter b. diffuses c. specular reflection d. oscillatory - ANSWER b. diffuses When a keratometric miers reflected off a soft contact lens are only clear when the wearer blinks, the lens fit is too- a. small b. large c. steep d. flat - ANSWER c. steep Transient keratometric mier distortion is usually due to- a. pre-ocular tear film abnormalities b. prolonged rigid lens wear c. prolonged soft lens wear d. irregular corneal astigmatism - ANSWER a. pre-ocular tear film abnormalities Epithelial edema which manifests itself clinically as central corneal haze, is verified by the slit lamp using sclerotic scatter illumination. What specific technique does the examiner use to see this condition? a. the naked eye and an angle between the slit lamp beam and the eye of 90˚ b. the blue cobalt filter of the slit lamp and an angle of about 45˚ c. the green filter of the slit lamp with high magnification d. high magnification and an angle between the beam and scope of 180˚ - ANSWER a. the naked eye and an angle between the slit lamp beam and the eye of 90˚ With a rigid contact lens in place a flourescein pattern shows a narrow bend horizontally with a concentration of flourescein inferiorly and superiorly under the lens. Which one of the following types of astigmatism is represented by this pattern? a. lenticular astigmatism