Instruments & RegulatoryQuestion 89 of 100
A Geneva lens clock (lens measure) reads what?
a.Lens power in the eye
b.Pupillary distance
c.Surface curvature (base curve) of a lens
d.Prism amount
Explanation
A lens clock, or Geneva lens measure, uses three pins to measure the sag of a lens surface and reports the surface curve in diopters, commonly used to check base curve and detect warpage.
Practice all 100 questions free — no signup required.
Related questions on this topic
- Occupational and safety eyewear in the U.S. is governed by which standard?
- Safety frames and lenses that meet the high-impact standard are marked with what?
- Under HIPAA, a patient's prescription and health information must be handled how?
- A distometer is used to measure what?
- Professional ethics require an optician who discovers a possible prescription error to do what?
- When cleaning and handling patient frames and instruments, an optician maintains professionalism by doing what?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against ABO (American Board of Opticianry) Certified Optician Exam · How we review