BO/III/10
Professional Course Examination, November 2018
3rd Semester
BACHELOR OF OPTOMETRY
Paper X
Visual Optics—I
Full Marks 40
Pass Marks 20
Time 2 hours
The figures in the margin indicate full marks for the questions
Answer any eight questions
1. Choose and write the correct answer 1×5=5
Haidinger brush is a/an
chromatic aberration phenomenon
entopic phenomenon
polarization phenomenon
Both and
If the corneal power is 44·00D@180º/45·00D@90º, then the radius of
curvature will be
7·80 mm@180º/7·60@90º
7·67 mm@180º/7·50@90º
7·00 mm@180º/7·60@90º
7·80 mm@180º/7·40@90º
/396 1 Contd.
SRK-I formula is
P A 0×9L 2×5K
P A 2×5L 0×9K
P L 2×5A 0×9K
None of the above
Pinhole is used
to detect refractive error due to pathological or refractive causes
to detect colour halos due to cataract or glaucoma
to detect corneal astigmatism
Both and
If k reading is 44·00D@180º/45·00D@90º, then the corneal
astigmatism will be
-1·00D@180º
+0·50D@90º
+1·00D@180º
Both and
2. How does fluorescein dye work? Write the ophthalmic uses of
fluorescein dye.
3. Write the principle of keratometer. Why is optical doubling important in
keratometry?
4. What are the etiological factors of refractive anomalies? 5
5. Describe Listing's reduced eye. 5
6. Write the trichromatic theory of colour vision. 5
/396 2 Contd.
7. What are the refractive mediums of eye? Write the importance of
transparency of the lens.
8. Explain projection chart. 5
9. Write on any two of the following 2½×2=5
Placido disc
Axial map of the corneal topography system
Light adaptation
10. What is visual acuity? Briefly explain light and dark adaptation.