ABO NOCE Basic Opticianry Ophthalmic Optics 5

Question 1

According to Prentice's Rule, a lens of +2.00 D with the optical center decentered 5 mm will produce how many prism diopters?

Accepted Answer

1.0 Δ

Answer

Prentice's Rule: Prism (Δ) = Power (D) × Decentration (cm) = 2.00 × 0.5 cm = 1.0 Δ.

Question 2

An object is placed 33 cm in front of a +4.00 D lens. Where does the image form?

Accepted Answer

100 cm behind the lens

Answer

Incoming vergence U = -1/0.33 = -3.00 D; V = P + U = 4.00 + (-3.00) = +1.00 D; image distance = 1/1.00 = 1.0 m = 100 cm behind the lens.

Question 3

What is the dioptric power of a surface with a radius of curvature of 0.10 m separating air (n=1.0) from glass (n=1.5)?

Accepted Answer

+5.00 D

Answer

Surface power = (n2 - n1) / r = (1.5 - 1.0) / 0.10 = 0.5 / 0.10 = +5.00 D.

Question 4

When transposing +2.00 -3.00 x 045 to plus-cylinder form, the result is:

Accepted Answer

-1.00 +3.00 x 135

Answer

To transpose: new sphere = algebraic sum (+2.00 - 3.00 = -1.00); change cylinder sign (+3.00); rotate axis 90° (045 + 90 = 135°), giving -1.00 +3.00 x 135.

Question 5

What property of light determines its color as perceived by the human eye?

Accepted Answer

Wavelength

Answer

The perceived color of light is determined by its wavelength, with visible light ranging from approximately 380 nm (violet) to 780 nm (red).

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Ophthalmic Optics 5