2020–2021 BCSC Basic and Clinical Science Course™
3 Clinical Optics
Chapter 3: Optics of the Human Eye
Chapter Exercises
Questions
-
3.1. Using the reduced schematic eye and the concept of the nodal point, what is the retinal image height of an 18-mm 20/40 Snellen letter at a distance of 20 ft (6 m)?
-
0.5 mm
-
0.05 mm
-
1 mm
-
0.1 mm
-
3.2. What is the approximate angle (in arcmin) subtended by the 20/40 Snellen letter at a distance of 20 ft (6 m)?
-
1 arcmin
-
2 arcmin
-
5 arcmin
-
10 arcmin
-
40 arcmin
-
3.3. What is the relative size of target lights in a Goldmann perimeter (with a radius of 33 cm) relative to their corresponding retinal image?
-
same
-
5 times larger
-
10 times larger
-
20 times larger
-
3.4. Describe the location of the far point of an emmetropic eye with relaxed accommodation. Do the same for a myopic eye and a hyperopic eye.
-
3.5. In an eye with mixed astigmatism, where are the focal lines located?
-
Both are in front of the retina.
-
One is in front of the retina, the other is on the retina.
-
One is in front of the retina, the other is behind the retina.
-
One is located on the retina, the other is behind the retina.
-
3.6. A patient with myopic vision is wearing eyeglasses that were prescribed incorrectly with an over-minus of 1.00 D. When he wears them, his near point of accommodation is 20 cm. What is his amplitude of accommodation?
-
none
-
1.00 D
-
5.00 D
-
6.00 D
Excerpted from BCSC 2020-2021 series : Section 3 - Clinical Optics. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.