FREE ABO-NOCE Spectacle Lens Aberrations Questions and Answers

Question 1

A patient wearing high-plus spherical lenses complains that straight lines appear curved inwards, especially at the edges of the lens. This is a classic example of which aberration?

Accepted Answer

Pincushion Distortion

Answer

Spherical Aberration

Answer

Chromatic Aberration

Answer

Coma

Question 2

Which lens property is measured by the Abbe value, and what aberration does a low Abbe value indicate a higher amount of?

Accepted Answer

Abbe Value; Chromatic Aberration

Answer

Refractive Index; Spherical Aberration

Answer

Specific Gravity; Distortion

Answer

UV Protection; Curvature of Field

Question 3

Spherical aberration results in light rays passing through the periphery of a lens focusing at a different point than rays passing through the center. This aberration is most effectively minimized by using what type of lens design?

Accepted Answer

An aspheric lens

Answer

A spherical lens

Answer

A slab-off lens

Answer

A lenticular lens

Question 4

When a wearer looks away from the optical center of a lens at an angle, they may experience blur. This is caused by light hitting the lens obliquely, creating two separate focal lines. What is this aberration called?

Accepted Answer

Marginal Astigmatism

Answer

Curvature of Field

Answer

Distortion

Answer

Coma

Question 5

A comet-shaped blur or flare extending from a point of light, viewed off-axis, is characteristic of which monochromatic aberration?

Accepted Answer

Coma

Answer

Spherical Aberration

Answer

Barrel Distortion

Answer

Chromatic Aberration

Question 6

The aberration that causes a lens to focus an image onto a curved surface rather than a flat plane is known as:

Accepted Answer

Curvature of Field

Answer

Pincushion Distortion

Answer

Oblique Astigmatism

Answer

Longitudinal Chromatic Aberration

Question 7

All of the following are considered Seidel aberrations (monochromatic aberrations) EXCEPT:

Accepted Answer

Chromatic Aberration

Answer

Spherical Aberration

Answer

Coma

Answer

Distortion

A patient wearing high-plus spherical lenses complains that straight lines appear curved inwards, especially at the edges of the lens.This is a classic example of which aberration?

A patient wearing high-plus spherical lenses complains that straight lines appear curved inwards, especially at the edges of the lens.
This is a classic example of which aberration?