Contact lens SEMINAR 2

Question 1

Answer 1

A- Cast moulding

B- lathe cutting

C- spin casting

Question 2

Question 2

Which statement about these topography images is CORRECT?

A. Both eyes show keratoconus

B. These are corneal thickness maps

C. LEFT: WTR astigmatism; RIGHT ATR astigmatism

D. LEFT: ATR astigmatism; RIGHT WTR astigmatism

E. None of the above

Answer 2

C

Question 3

Question 3

What is the desired endpoint of our keratometer image?

A. Crosshair in the centre of the top right circle, all circles in focus, superimpose minus signs and plus signs

B. Crosshair in the centre of the top right circle, all circles in focus, minus signs and plus signs touch the opposing circles

C. Crosshair in the centre of the bottom right circle, all circles in focus, minus signs and plus signs touch the opposing circles

D. Crosshair in the centre of the bottom right circle, all circles in focus, superimpose minus signs and plus signs

Answer 3

D

Question 4

Answer 4

a,d,h for image 1

e,h for image 2

g for image 3

Question 5

Question 5.

Which of these statements is FALSE?

A. The average corneal power is approximately 43 D

B. A healthy cornea has a prolate surface shape

C. The anterior float map represents the anterior elevation map

D. The axial curvature map is also known as the sagittal map

E. None of the above

F. All of the above

Answer 5

E