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CONTINUING EDUCATION AND TRAINING
Gain 2 CET credits - enter online at www.otcet.co.uk or by post
Module questions
Course code: c-4090
Please note, there is only one correct answer. Enter online or by form provided.
1. For a highly irregular corneal topography would you
try as first choice...
a. Non-ventilated impression RGP scleral lens?
b. Preformed fenestrated RGP scleral lens?
c. Fenestrated impression PMMA scleral lens?
d. Non-ventilated preformed RGP scleral lens?
2. What is the optimum corneal clearance for a
non-ventilated RGP scleral lens?
a. Not more than 0.1mm
b. Not less than 1.0mm
c. Between 0.2mm and 0.3mm
d. Between 0.4mm and 0.9mm
3. If the BSR is changed from 13.50mm to 14.50mm
without altering the OZP, would you expect...
a. Increased apical clearance
b. Reduced apical clearance
c. There would be no difference
d. There would be increased vaulting from the scleral zone
4. What is the most probable objective when
fenestrating an RGP scleral lens?
a. To enable easier handling
b. To increase apical clearance
c. To create corneal contact
d. To give a crescent-shaped bubble under the lens
5. What is the usual objective when fenestrating a
PMMA scleral lens?
a. To give a crescent shaped bubble
b. To increase apical clearance
c. To facilitate oxygenated tear exchange
d. To create corneal contact
6. What would be the reason for considering a scleral
lens in moderate keratoconus?
a. To improve on vision achieved with a corneal lens
b. To give increased oxygenation
c. To alleviate corneal contact
d. To create corneal contact
7. Comparing small and large diameter non-ventilated
scleral lenses, would you expect...
a. More limbal clearance with the smaller lens?
b. More apical clearance with the smaller lens?
c. Better tear pool retention with the larger lens?
d. The smaller lens to be more stable on the eye?
8. What is the most common modern indication for
scleral lenses?
a. Aphakia
b. High myopia
c. Keratoconus
d. Corneal transplant fitted post-operatively
9. What is meant by the term sealed in the context of
scleral lens practice?
a. Near perfect alignment to the cornea
b. Near perfect alignment to the sclera
c. A lens retaining an air bubble-free tear pool
d. A lens which is very difficult to remove
10. Under what circumstances could a PMMA scleral be
arguably preferable to an RGP scleral?
a. For keratoconus
b. Never
c. For aphakia
d. For work in dusty environments
11. If the BSR is changed from 14.50mm to 13.50mm, & the OZP
is increased one clinically significant step, would you expect...
a. An 0.25mm increase in the apical clearance?
b. A 0.50mm or greater increase in the apical clearance?
c. No change in the apical clearance?
d. A reduction in apical clearance of 0.25mm?
12. What would be the probable outcome of reducing the diameter
of a non-ventilated RGP scleral lens from 23mm to 18mm?
a. Increased apical clearance
b. More decentration of the lens
c. An apical contact zone
d. More chance of the lens falling out
An answer return form is included in this issue.
It should be completed and returned to:
CET initiatives (c-4090), OT, McMillan Scott, 9 Savoy Street, London, WC2E 7HR by November 15. Under no circumstances will forms received after this date be
marked – the answers to the module will be published in our December 15 issue.
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33 | October 20 | 2006 | OT