OCTOBER 2017 Sub. Code: 1604
M. OPTOM DEGREE EXAMS
FIRST YEAR
PAPER IV CONTACT LENS I
Q.P. Code: 281604
Time: Three hours Maximum: 100 Marks
I. Elaborate on: x 20 40)
1. Explain steps in pre fitting and assessment of fitting in a soft contact lens in a
patient with refraction of od;-8.00/-2.00* 180 5.00ds.
2. Explain in detail indication and contraindication of different contact lenses.
II. Write notes on: (10 x 6 60)
1. Explain the relationship between sag, base curve and diameter and their rule of
thumb with examples.
2. List the indications/partial indications and precautions, and contraindications of
contact lens in detail.
3. Explain required detailed history taking in new contact lens patient.
4. Explain different manufacturing of soft lenses and their advantage and
disadvantage.
5. Diagrammatically explain fluroscein pattern and fit assessment in spherical rgp
lens.
6. List the characteristics of steep and flat soft lens.
7. Explain with diagram fitting in spherical cornea and 4 Diopter toric cornea with a
spherical RGP lens.
8. Explain special instructions required while dispensing soft contact lens.
9. Explain different stages of corneal edema during hypoxia. Explain sources of
oxygen for cornea during closed and open eye conditions.
10. Explain advantage and disadvantage of different manufacturing techniques used
in contact lens.