Exam (elaborations)
NCLE Prep Exam 3 of 4 Questions and Answers 100% Solved
- Course
- Institution
NCLE Prep Exam 3 of 4 Questions and Answers 100% Solved
[Show more]
Content preview
NCLE Prep Exam 3 of 4 Questions and Answers 100%Solved
The profile analyzer evaluates the peripheral curve blends and the radiuscope measures the
base curve of the rigid contact lens. The measuring magnifier is the only instrument that will
measure the parameters listed.
Assessment of the quality of the peripheral curves (blends) of a rigid contact lens is
achievable
by the use of the:
A. Profile analyzer
B. Shadowgraph
C. Profile analyzer
D. Burton lamp -Answer A. Profile analyzer
All of the listed instruments show that a rigid contact lens has blends. However, the only
instrument that can adequately assess the quality of the blends between the peripheral
posterior curve (PPC), intermediate posterior curve (IPC) and the central posterior curve
(CPC),
is the profile analyzer.
The instrumental used for magnification of the edge of a rigid contact lens is a:
,A. Keratometer
B. Shadowgraph
C. Profile analyzer
D. V-groove gauge -Answer B. Shadowgraph
A keratometer measures the corneal curvature. A profile analyzer measures the peripheral
curves (blends) and a v-groove gauge measures the diameter of a rigid contact lens.
The tolerance for lens power under +/-10.00D is:
A. 0.12D
B. 0.25D
C. 0.37D
D. 0.50D -Answer A. 0.12D
According to the ANSI standards (Z80.2 - 1989), the tolerance for the power of a contact lens
under +/-10.00D is +/-0.12D
Which of the following will NOT measure contact lens parameters?
A. Keratometer
B. Radiuscope
C. Burton lamp
, D. Thickness gauge -Answer A keratometer will measure the base curve of a lens with an
attachment known as a con-ta-check; however, a radiuscope is most frequently used. A
thickness gauge will measure the center thickness of a contact lens. A burton lamp evaluates
the fluorescein pattern similar to a slit lamp.
A warped lens will show ________ base curve(s) on the radiuscope and a ________ power on
the lensometer.
A. One / sphero-cylindrical
B. Two / sphero-cylindrical
C. One / sphero-cylindrical
D. Two / spherical -Answer D. Two / spherical
Verification should show the following:
Lens type - Radiuscope - Lensometer
Spherical - One base curve - Spherical Rx
Warped - two base curves - spherical rx
Front toric - one base curves - sphero-cylindrical rx
Back toric - two base curves - sphero-cylindrical rx
Bi-toric - two base curves - sphero-cylindrical rx
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TheeGrades. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78112 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now