Printer Friendly

Anterior eye & contact lens assessment course code: C-15341 O/D/CL.

1. Which of the following statements about the technique shown in Image A is FALSE?

a) The observation and illumination should be decoupled b) Illumination should be placed at the limbus c) The angle between observation and illumination should be about 45[degrees] d) Magnification should be set at 16-25x

2. For which of the following can the technique shown in Image A be used to assess?

a) The location of a corneal foreign body b) The depth of a corneal foreign body c) Corneal thickness d) The presence of corneal staining

[ILLUSTRATION OMITTED]

3. Which of the following statements about the instrument shown in Image B is FALSE?

a) It has a cold light source b) It allows quantitative assessment of tear break-up time (TBUT) over the whole cornea c) It allows measurement of corneal curvature d) It allows qualitative assessment of the lipid layer of the tear film

4. Which of the following filters CANNOT be used with the instrument shown in Image B?

a) Blue filter for sodium fluorescein assessment of the tear film b) Placido disc filter for assessment of corneal shape c) A filter for assessment of tear osmolarity d) Grid filter for measurement of non-invasive tear break-up time (NIBUT)

[ILLUSTRATION OMITTED]

5. Which of the following statements regarding the instrument shown in Image C is FALSE?

a) It is a one-position keratometer b) It is a two-position keratometer c) It can be used to measure tear break-up time (TBUT) d) It can be used to measure irregular astigmatism

6. When looking through the eye piece of the instrument shown in Image C, what is indicated by the appearance shown in the far right panel of Image C?

a) There is mild keratoconus present b) The subject is not fixating steadily c) There is corneal warpage present d) There is regular astigmatism of over 1.50D

[ILLUSTRATION OMITTED]

7. Which of the following statements regarding the output shown in Image D is FALSE?

a) Steep points are represented by hotter colours eg, red b) Flat points are represented by cooler colours eg, blue c) Bow tie shapes indicate irregular astigmatism d) Nipple shapes indicate an area of steepening

8. Which of the following statements about the technique used to obtain Image D is TRUE?

a) A diameter of 2-3mm is measured with 5-20 data points captured b) A diameter of 5-6mm is measured with 50-200 data points captured c) A diameter of 9-10mm is measured with 500-2000 data points captured d) A diameter of 9-10mm is measured with 5000-20000 data points captured

[ILLUSTRATION OMITTED]

9. Based on the readings shown in Image E, how much corneal astigmatism is present in the right eye?

a) 0.25DC b) 0.75DC c) 1.50DC d) 3.00DC

10. Based on the readings shown in Image E, what would be the most appropriate back optic zone radius (BOZR) of an RGP contact lens to select initially for this eye?

a) 7.70 b) 7.75 c) 7.85 d) 7.95

[ILLUSTRATION OMITTED]

11. Which of the following parameters can be evaluated using the instrument shown in Image F?

a) Back optic zone radius (BOZR) and lens thickness b) Back optic zone radius (BOZR) and back optic zone diameter (BOZD) c) Back optic zone radius (BOZR) and back vertex power (BVP) d) Back optic zone diameter (BOZD) and lens thickness

12. If a reading of 0.15mm is obtained using the instrument shown in Image F, which of the following is this likely to represent?

a) Centre thickness of an RGP contact lens b) Peripheral thickness of an RGP contact lens c) Back optic zone radius of an RGP contact lens d) Back optic zone diameter of an RGP contact lens

[ILLUSTRATION OMITTED]

About the author

Dr Shehzad Naroo is senior lecturer at Aston University where his teaching responsibilities include contact lenses, anterior eye and therapeutics. He is global vice-president of the International Association of Contact Lens Educators (IACLE), and editor-in-chief for the journal, Contact Lens & Anterior Eye.

Associated reading:

The Contact Lens Manual: A practical guide to fitting (fourth edition) by Andrew Gasson and Judith A. Morris. Eye essentials: Rigid Gas-Permeable Lens Fittingby Ngaire Franklin, Elsevier Health Sciences, 2006

Corneal Topography by Amar Agarwal, Elizabeth A. (FRW) Davis, Anshan, 2009

Contact Lens Practiceby Nathan Efron, Butterworth-Heinemann, March 2010
COPYRIGHT 2011 Ten Alps Publishing
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2011 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:VRICS: VISUAL RECOGNITION AND IDENTIFICATION OF CLINICAL SIGNS
Author:Naroo, Shehzad
Publication:Optometry Today
Date:Jan 28, 2011
Words:721
Previous Article:How is the current downturn affecting practice values? Director of R A Valuations Mark Ridout looks at the current state of play in the sector's...
Next Article:Win with OTs Mystery Year competition--week two.

Terms of use | Privacy policy | Copyright © 2021 Farlex, Inc. | Feedback | For webmasters |