Toric contact lenses - Study guides, Revision notes & Summaries

NCLE Study Guide Questions with Correct Answers Back Surface Power - Answer-Effective power of a lens when measured from the back surface. Back Surface Toric Lens - Answer-A lens in which the posterior surface has two different radii and the anterior surface is spherical. Ballasted Lens - Answer-A lens with a heavier base which becomes oriented inferiorly or downward when the lens is worn. Bicurve Lens - Answer-A contact lens which contains two curves: one base curve and one secondar...

A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - Answer d) have the ability to reproduce Which of the following prescriptions indicates against-the-rule astigmatism? a)-4.50 +1.00 x75 b)-4.50 +1.00 x 180 c)-4.50 -1.00 x 165 d)4.50 -1.00 x 180 - Answer a)-4.50 +1.00 x75 When a keratometer is being calibrated, which of ...

NCLE Practice Test Questions And Answers Latest Update 2023/2024 | 100% Verified. A long-term, successful, hydrogel contact lens wearer suddenly develops dry eyes. Which of the following is most likely to cause this problem? a) Use of oxidative solution b) use of rewetting drops c) use of anti-histamines d) Wearing of lenses in the wrong eyes - Answer c) use of anti-histamines During slit-lamp evaluation, on upward gaze, a patient's soft contact lenses move 0.5 to 1mm when the patient bl...

NCLE Exam Review Questions and answers. VERIFIED/ What is the thickest layer of the cornea? - stroma Which corneal layer controls the fluid content of the cornea? - endothelium What is cornea edema? - excess fluid in the stroma that can swell it and lead to loss of visual acuity What kind of contact lenses must be stabilized (not rotate) on the eye for good vision? - toric contact lenses Concentric vs Aspheric Multifocal Lens Design - aspheric multifocal lenses have a gradual change in ...

NCLE Practice Exam Questions with Correct Answers Already Graded A+ 2023-2024. Upon initial insertion of a GP lens, the patient complains about flare. To correct this problem, the fitter should choose a lens with a/an: a) increased base curve b) increased optical zone c) decreased optical zone d) flattened base curve - Answer b) increased optical zone Which curve would a fitter modify to allow more tear flow under the edge of a rigid lens? a) Posterior peripheral curve b) Optical curve ...

Steep Fluorescein Pattern - ANSWER-Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - ANSWER-Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - ANSWER-Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern - ANSWER-Bright green pooling vertically, faint green pooling horizontally Prism Ballast - ANSWER-Common technique to stabilize le...

Steep Fluorescein Pattern - Answer Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - Answer Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - Answer Bright green pooling horizontally, faint green pooling vertically With-the-rule Astigmatism Pattern - Answer Bright green pooling vertically, faint green pooling horizontally Prism Ballast - Answer Common technique to stabilize le...

The answer is D. The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable lens. If the posterior optical zone is steepened, it will increase the sagittal depth. If it is flattened, it will decrease the sagittal depth. Changing the power, which is accomplished by changing the anterior optical zone, will not affect the sagittal depth of the lens, nor will changing its edge design. - ANSWER 1. The sagittal depth of a rigid gas permeable contact len...

NCLE Practice Test Questions And Answers Latest Update 2023/2024. A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - Answer d) have the ability to reproduce Which of the following prescriptions indicates against-the-rule astigmatism? a)-4.50 +1.00 x75 b)-4.50 +1.00 x 180 c)-4.50 -1.00 x 165 d)4.50 -1.00 x 180 - Answer a)-4.50 +1...

Ncle Advanced Exam Questions And Answers Latest Update 2023/2024 Rated A+. 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 ...