ABO ABO Industry Standards 2

Question 1

According to ANSI Z80.1, what is the allowable tolerance for sphere power in single vision lenses with a power of ±0.25D to ±6.50D?

Accepted Answer

±0.13D

Answer

ANSI Z80.1 specifies a sphere power tolerance of ±0.13D for prescriptions between ±0.25D and ±6.50D.

Question 2

What does the term 'vertex distance' refer to in ophthalmic standards?

Accepted Answer

The distance from the back surface of the lens to the cornea

Answer

Vertex distance is the distance measured from the back (ocular) surface of the ophthalmic lens to the front of the cornea.

Question 3

Under ANSI Z87.1, occupational and educational eye protection must be marked with which designation to indicate basic impact resistance?

Accepted Answer

Z87

Answer

The Z87 marking on safety eyewear indicates it meets ANSI Z87.1 basic impact requirements.

Question 4

What is the minimum refractive index required for a lens to be classified as 'high-index' by industry convention?

Accepted Answer

1.53

Answer

By industry convention, lenses with a refractive index of 1.53 or higher are generally classified as high-index.

Question 5

Which ANSI standard governs the requirements for prescription ophthalmic lenses in the United States?

Accepted Answer

ANSI Z80.1

Answer

ANSI Z80.1 is the American National Standard for Prescription Ophthalmic Lenses and specifies optical and physical requirements.

ABO - American Board of Optometry Practice Test