NOCE Ophthalmic Products and Frames 2

Question 1

Which frame material is most resistant to chemical solvents and is often recommended for patients who work in laboratory environments?

Accepted Answer

Nylon (polyamide)

Answer

Nylon (polyamide) frames are highly resistant to chemical solvents and heat, making them suitable for laboratory or industrial environments.

Question 2

A patient's frame has a bridge size of 18 and an eye size of 52. Using the boxing system, what is the distance between lenses (DBL)?

Accepted Answer

18 mm

Answer

In the boxing system, the bridge size (DBL) is the measurement between the two lenses, which in this case is 18 mm.

Question 3

What is the primary advantage of a frame with a comfort cable temple compared to a standard skull temple?

Accepted Answer

Greater retention behind the ear for active patients

Answer

Comfort cable temples wrap around the ear, providing greater retention, which is ideal for children and physically active patients.

Question 4

Which of the following lens materials has the highest Abbe value, indicating the least chromatic aberration?

Accepted Answer

CR-39 (Abbe ~58)

Answer

CR-39 has an Abbe value of approximately 58, the highest among common ophthalmic plastics, meaning it produces the least chromatic aberration.

Question 5

A patient wants photochromic lenses but spends most of their time driving. What should you advise?

Accepted Answer

Photochromics may not darken adequately inside a car because most windshields block UV

Answer

Most car windshields are UV-laminated and block the UV light needed to activate standard photochromic lenses, limiting their darkening inside vehicles.

NOCE - National Opticianry Competency Examination Practice Test

NOCE - National Opticianry Competency Examination Practice Test

NOCE Ophthalmic Products and Frames 2