ABO NOCE Basic Opticianry Ophthalmic Optics Questions and Answers

Question 1

A patient's prescription is OD: -5.00 D sphere, OS: -2.00 D sphere.
If their pupils are decentered 4 mm inwards from the optical centers of the lenses, what is the total amount and direction of induced horizontal prism?

Accepted Answer

2.8 prism diopters Base Out

Answer

0.8 prism diopters Base In

Answer

1.2 prism diopters Base In

Answer

2.0 prism diopters Base Out

Question 2

A patient with anisometropia experiences vertical imbalance when reading. The prescription is OD: +1.00 D sphere, OS: +4.00 D sphere, with a +2.00 Add. Assuming a reading level 10 mm below the optical centers, which of the following is the most appropriate corrective action?

Accepted Answer

Order a slab-off (bicentric grind) on the right lens.

Answer

Prescribe single vision reading glasses only.

Answer

Increase the pantoscopic tilt to 15 degrees.

Answer

Order a slab-off (bicentric grind) on the left lens.

Question 3

Which of the following lens materials has the highest index of refraction, resulting in the thinnest and lightest lens for a given high prescription?

Accepted Answer

High-Index Plastic 1.74

Answer

Crown Glass

Answer

CR-39 Plastic

Answer

Polycarbonate

Question 4

A lens aberration that causes light of different colors (wavelengths) to focus at different points, resulting in colored fringes around objects, is known as:

Accepted Answer

Chromatic Aberration

Answer

Spherical Aberration

Answer

Coma

Answer

Distortion

Question 5

Using the 'minus cylinder' form, what is the correct transposition of the prescription +1.00 +1.50 x 090?

Accepted Answer

+2.50 -1.50 x 180

Answer

+1.00 -1.50 x 180

Answer

-0.50 +1.50 x 180

Answer

+2.50 +1.50 x 090

Question 6

A plus power lens is essentially two prisms oriented in which configuration?

Accepted Answer

Base to base

Answer

Apex to apex

Answer

Base to apex

Answer

Apex to base

A patient's prescription is OD: -5.00 D sphere, OS: -2.00 D sphere.If their pupils are decentered 4 mm inwards from the optical centers of the lenses, what is the total amount and direction of induced horizontal prism?

A patient's prescription is OD: -5.00 D sphere, OS: -2.00 D sphere.
If their pupils are decentered 4 mm inwards from the optical centers of the lenses, what is the total amount and direction of induced horizontal prism?