Ncle Advanced Exam Questions With Correct Answers

Which of the following medications may affect successful contact lens wear? a. antacids b. antihistamines c. aspirin d. laxatives - Answer antihistamines Which term refers to a sensitivity to light A.presbyopia B.Photophobia C.Pannus D. Ptosis - Answer Photophobia The following is an example of what type of astigmatism? K's 42.50 @180 /40.50 @90 A. with the rule B. Lenticular astigmatism C.Against the rule D. Irregular astigmatism - Answer Against the rule astigmatism The cornea receives nutrients from 1 Aqueous humor 2 Tears 3 Limbal blood vessels 4 Orbicularis occuli a. 1, 3 & 4 b. 2 & 3 c. 1, 2 & 3 d. 3 & 4 - Answer aqueous humor, tears and limbal blood vessels The increased loss of ability of the crystalline lens to accommodate is called? - Answer presbyopia Which instrument can provide simultaneous information about the cornea, lids, conjunctivitis, lashes, contact lens surface and fit? A. Radius scope B. Corneascope C. Slitlamp D. Keratometer - Answer Slit lamp The classic model of the pre-corneal tear film is composed of three layers what are they? - Answer Lipids aqueous mucin The average ph value of the human tear is a. 6.6 b. 7.4 c. 7.8 d. 10.0 - Answer B. 7.4 If the manufacturers guidelines suggest a minimum of four hours for this disinfection, what would you suggest to the patient A.Never leave lenses in disinfectant overnight B.2 to 3 hours is probably enough C.Use surfactant cleaner and preserved saline D. A minimum of four hours is required - Answer A minimum of four hours is required The main supply of oxygen to the corneal epithelium is derived from the A.Stroma B.Collagen fibrils C.Basal membrane D.Tear film - Answer Tear film What is the term for the condition in which there is loss of vision without any apparent disease to the eye? - Answer amblyopia Which auxiliary lens will extend the keratometer range to approximately 30.00D? - Answer -1.00 Which step should be performed first when taking keratometer measurements? - Answer Focus the eyepiece The following is an example of what type of astigmatism K's 44.00 @180/ 44.50 @90 RX -3.00 -2.50 X 180 - Answer Lenticular astigmatism Ocular signs of aging include A. Tear film abnormalities B.Reduced lid elasticity C.Lens opacities D.Loss of accommodation - Answer Tear film abnormalities Reduced lid elasticity Lens opacities Loss of accommodation The pre-corneal tear film provides: - Answer A smooth optical surface, metabolic nutrients to the epithelium What are the layers of the cornea? - Answer Epithelium, bowmans layer, stroma, Descemet's membrane, endothelium The normal cornea is transparent due to the pump action creating proper fluid balance. Which layer of the cornea is most responsible for maintaining this function? - Answer endothelium A normal tear break-up time is: - Answer 10-12 seconds A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the elderly is known as? - Answer Arcus senilus Patients with keratitis sicca are more prone to? - Answer Secondary infections Upon removal of the crystalline lens the patient is? - Answer Aphakic The following are RX represents OD+2.00= 20/20 OS-3.00-2.00X180=20/20 - Answer Anisometropia This patient OD+2.00= 20/20 OS-3.00-2.00X180=20/20 will best achieve stereopsis with which of the following modalities? A. Contact lenses B.Spectacles C. IOL D.Bifocals - Answer Contact lenses Tom spectacles with the power of -12.00+0.50X 90, 10 mm in front of his cornea. The likely soft contact lens prescription for Tom would be - Answer A -10. 50 dpt The keratometer is an instrument used to measure? - Answer corneal curvature The average lifespan of a corneal epithelium cell from mitosis through maturation and desquamation most nearly approximates - Answer One Week Which auxiliary a trial lens will extend the keratometer range to approximately 61.00D? - Answer +1.25 D Wearing lenses in high altitudes and dry environments may result in complaints of all but the following? A.Photophobia B. Chalazion C.Grittiness D.Burning sensation - Answer Chalazion The first line of defense in the protective system of the eye is formed by the? - Answer Eyelids Transient keratometric mire distortion is usually due to: - Answer Pre - ocular tear film In against the rules astigmatism the steepest corneal meridian is in - Answer Is at or near 180° An inability to bring all the keratometer mires into focus at the same time may indicate - Answer Irregular astigmatism In an alignment lid attachment GP fit, the fluorescein in pattern should show? - Answer A thin, even layer of fluorescein and less than 180° of bearing in the mid periphery In a GP wearer, an arcuate stain on the cornea may be due to ? - Answer Poorly blended secondary curves In a Schirmer 1 test - Answer A patient with an an unanesthetized eye and normal to your output should wait at least 15 mm of the filter paper in five minutes The most powerful refractive surface of the eye is the - Answer Cornea Which keratometer reading indicates with the rule astigmatism? A. 45.00 @ 175/ 44.50 @85 B. 48.00 @ 45/46.50 @135 C.44.50 @15/44.75 @ 105 D.46.00 @ 180/46.00 @ 90 - Answer 44.50 @15/44.75 @ 105 When evaluating tear film break up time - Answer A break-up time of less than 10 seconds may preclude success with contact lenses The preservatives in contact lens solution - Answer Is formulated to keep micro organisms from multiplying in a bottle of a contact lens solution after it has been opened Results of a refraction show a patient to see best at distance with the power of a +1.25+1.00X 95, and at near where the power of +2.50+1.00X 95. What is the ad power - Answer +1.25D A pre-presbyopic myopic patient who is still able to read with single vision glasses may find that - Answer They are unable to see fine print when they're fit with contact lenses Amy's +8.50D spectacles sit 12 mm from the cornea. The power of a soft contact lens for Amy, properly vertexted, would be? - Answer +9.50D Which of the following choices would work best for the patient's visual need given the following information: K's 44.00 @180 /45.25 @90 RX -3.00+0.25 x90 - Answer spherical soft lens Which of the following set of lens specifications would best simulate intrapalpebral GP fitting given the following information K's 42.00 @ 180/43.00 @ 90 RX -2.00-1.00X 180 Upper lid positions to millimeters above the superior Limbus A.42.50-2.50 8.5 B.41.50-1.50 8.5 C. 42.00-2.00 9.5 D.41.50-1.50 9.5 - Answer 42.50-2.50 8.5 Which contact lens would best correct this patient's visual needs, given the following information K's 46.00 at 180/45.50 @90 RX -3.00-1.50 X 90 - Answer Soft toric lens The average HVID for a patient is - Answer 11.5 mm If a patient has 1.50 D of refractive cylinder and keratometer readings of 44.00 @ 180/44.50 @ 90, you would expect a spherical gas permeable lens to - Answer Result in residual astigmatism Application in fluorescein should be used in which following situations? Evaluation of gas permeable lens Evaluation of soft contact lens parameters Evaluation of vascularization of the cornea Evaluation of gas permeable lens over-refraction - Answer Evaluation of gas permeable lenses fit If the diagnostic gas permeable lenses placed on the eye results and minimal movement, which of the following will increase the movement on the lens ordered for the patient? A.Decreasing overall length diameter B.Increasing overall length diameter C.Increasing optic zone diameter D.Increase sagittal depth - Answer Decrease in overall length diameter Contact lens technicians work with prescriptions in minus cylinder form because? - Answer The lacrimal lens is a minus cylinder lens RX OU -3. 00-0.50 X 180, Add +1.25. If spherical soft lenses are being used to fit using the monovision technique, what is the desired power for the eye fitted for near? - Answer -2.00 Which of the following lens designs would provide best visual results for this patient? K' S 43.00 @ 180/46.00 @ 90 RX -3.00 sphere A.Soft toric B.Spherical gas permeable Lens with the increase center thickness C.Truncated gas permeable lenses D.Soft spherical lens - Answer Soft spherical lens Which edge design is recommended for a +15.00D aphakic GP lens? - Answer Lenticular myoflange What lens designs would provide the best visual result for this patient? K's 42.00 @180 42.50 @90 RX-3.50 -1.75X180 - Answer Soft toric lens What RX would be ordered for a gas permeable lenses to fit on K? K's 43.00@180/44.00@90 RX-3.00+1.00x90 - Answer -2.00 To aid in the positioning of a GP prism ballast lens ridding too low and slipping underneath the lower lid, which of the following might be helpful? A. Hyper flange B.More prism C.Truncation D.Thinner edge design - Answer Truncation