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Take Test C10082

Visual Recognition & Interpretation of Clinical Signs
Optical Low Vision Aids
2 CET Points (General)  Optometrists and Dispensing Opticians

To receive your CET points for this article, complete the Multiple Choice Questions. 
A pass mark of 66% (8 out of 12 correct answers) must be achieved. 
Only one attempt is allowed. The deadline for responses is 31st October 2009
*Q1: How should the patient focus the image?
A: Ask the patient to wear her distance correction.
B: Move the magnifier closer in to the page
C: Ask the patient to move closer to the magnifier.
D: Turn on the integral LED light
*Q2: Which of the following statements is true for hand magnifiers?
A: An aspheric hand magnifier has more effective magnification compared to the spherical design.
B: Hand magnifiers are available up to +80 dioptres.
C: Patients must wear their near correction whilst using hand magnifiers.
D: A GOS3 voucher may not be used towards the cost of a hand magnifier.
*Q3: How should the patient improve the field of view?
A: Remove his near vision correction.
B: Lift the magnifier off the page.
C: Reduce his eye - lens working distance.
D: Further improvement is no longer possible – currently set at maximal field of view (FOV).
*Q4: Which of the following statements about the properties of these stand magnifiers is true?
A: The image on the left may be focused by lifting the magnifier off the page.
B: The image on the left is out of focus because the position of the lens is less than 5cm above the desk.
C: The position of the lens on the right is 5cm above the desk.
D: All of the above are true.
*Q5: Which of the following statements is false for flat-field magnifiers?
A: Magnification is limited to approximately 1.8x.
B: The design features light-gathering properties.
C: The design consists of an aspheric sphero-cylinder.
D: The flat base rests on the material and is moved along as necessary.
*Q6: Which of the following properties of bar magnifiers’ is false?
A: The patient’s near vision correction may be worn.
B: Magnification is limited to approximately 5x in one direction only (vertical).
C: Bar magnifiers aid visual tracking.
D: Bar magnifiers are typically used to magnify just one line at a time.
*Q7: Which of the following statements regarding this magnifier is true?
A: This is a near vision telescopic magnifier.
B: The lens button may be removed and replaced with another of different power.
C: The range of magnification is available from 2x to 12x (binocularly).
D: This type of spectacle is not suitable for children.
*Q8: Which of the following is false regarding this Hyperocular lens?
A: A Hyperocular is a form of high-powered spectacle magnifier.
B: A Hyperocular is a biconvex aspheric lenticulated lens.
C: Hyperocular ranges from x4 to x12 magnification.
D: Hyperocular lenses may not be glazed in a half eye frame.
*Q9: Which of the following statement is false regarding this telescopic device?
A: It is based upon the design of a Galilean telescope.
B: It achieves a greater working distance compared to the spectacle magnifier of the same power.
C: It has a very restricted field of view.
D: It may be converted to a distance telescope by adding a positive end-cap.
*Q10: Why is it not possible to produce this design of low vision aid in 4x magnification?
A: The prism would result in the device becoming too heavy for use.
B: The eye-piece would require a compound lens system which would result in too many aberrations.
C: The telescope's exit pupil would be too far away from the eye thus reducing light and image quality.
D: The length of the tube would be too long and heavy for use as a low vision aid.
*Q11: Reverse contrast is preferred by most visually impaired patients because,
A: Reverse contrast improves retinal image contrast.
B: Reverse contrast reduces the amount of light scatter within the eye.
C: Reverse contrast has been shown to improve visual performance and reading speed.
D: All of the above are true.
*Q12: Which of the following statements regarding CCTV’s & video magnifiers is false?
A: Children may receive funding for equipment from the Local Education Authority.
B: Employees may receive funding for equipment from the Department of Employment.
C: Older citizens may receive funding for equipment from the Local Health Authority.
D: Video magnifiers and conventional CCTV’s have the greatest range of magnification of any optical low vision aid.
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