Data

Question 1

Power of eye

Major contribution towards power of eye

Power of lens

Refractive index of air, cornea, aquous humour, lens, lens nucleus, vitreous humour

Answer 1

58-60 D

Air cornea interface, 45 D

17 D

RI air =1
    Aq humour and vitreois humor= 1.33
    Cornea =1.376
    Lens =1.39
    Lens nucleus =1.42

Question 2

High myopia

High Hypermetropia

Physiological defect of eye at birth

Answer 2

> -6 D

> +5 D

2.5 to 3 D

Question 3

Formula of retinoscopy

Answer 3

Refractive error =

retinoscopy - 1/distance - cycloplegia used
Value

Question 4

Value of cycloplegia

Atropine
Cyclopentolate
Homatropine
Tropicamide
Phenylephrine

Answer 4

1
0.75
0.5
0.25
0

Question 5

Normal thickness of cornea

Size of flap cut in LASIK

Requirement of residual stromal bed in lasik

Thickness of cornea available for consumption in lasik

Thickness of cornea to be consumed for every diopter of myopia correction

Answer 5

540-550 micrometer

100 micrometer

250-300 micrometer

150 micrometer

12-15 micrometer

Question 6

Minimum corneal thickness requirement for lasik

Myopia that can be corrected by lasik

Hypermetropia that can be corrected by lasik

Astigmatism that can be corrected by lesik

Answer 6

500 micrometer

-1 to -12 D

Upto +6 D

Upto 6 D

Question 7

Corneal thickness for photorefractive keratectomy

Minimum anterior chamber depth for phakic IOL/ implantable contact lens

Answer 7

470-500 micrometer

> 2.8 mm

Question 8

Criteria for anisometropia

Answer 8

> 2.5 D difference in power between 2 eyes

Question 9

Portion of sclera that is cornea

Size of cornea at birth

Size of cornea in adult, Vt and Hz axis

Definition of megalocornea

Definition of microcornea

Answer 9

1/6 th

10 mm

Vt 11 mm, Hz 11.7 mm

> 13 mm after 2 yr or adult sized at birth

< 10 mm

Question 10

Number of cell layers in corneal epithelium

Number of cells in corneal endothelium

1) At birth
2) In adulthood
3) Critical level beyond which bullous keratopathy occurs

Answer 10

5

1) 6000
2) 2500-3000
3) <500

Question 11

Concentration of

Conc Tobramycin

Conc Cefazolin

Atropine

Treatment of bullous keratopathy

Answer 11

1.3%

5%

1%

5% topical NS

Question 12

Age for diagnosis of arcus juvenilis

Time limit for cadaveric eye donation

Time limit for preservation in

1) moist chamber
2) modified MK medium
3) optisol
4) k-sol
5) organ culture
6) cryopreservation

Answer 12

<40 yr

6 hr in warm climate
12 hr in cold climate

1) 48 hr
2) 4 day
3) 4 day
4) 4 day
5) 4 week
6) indefinitely

Question 13

Normal IOP

Normal diurnal variation of IOP

% of aqueous flow through trabecular meshwork

% of aqueous flow through uveoscleral outflow

Defn of increased IOP in glaucoma

Normal cup disc ratio

Lag period of Phacoanaphylactoid glaucoma

Answer 13

10-21 mmHg/
16+/- 2.5 mmHg

4-8 mmHg

90%

10%

> 21 mmHg/ >8 mmHg diurnal variation

0.3:1

48 hr

Question 14

Time required to travel the visual pathway

Answer 14

124 mS

Question 15

Total number of

Rods

Cones

Ganglion cells

Nerve fibre axon

Answer 15

120 million

6 million

1. 2 million
2. 2 million / 1 million

Question 16

Diameter of

Optic disc

Btw temporal edge of disc and fovea

Foveola

Foveal avascular zone

Fovea

Macula

Answer 16

1.5 mm 1 DD

3 mm 2 DD

0. 35 mm
1. 5 mm
2. 35 mm
3. 5 mm

Question 17

Frequency of eye examination in diabetes

First time eye examination in type 1 DM

First time eye examination in type 2 DM

Frequency of examination in GDM

Answer 17

1 yrly

After 5 yrs

Immediately

Every trimester

Question 18

Susceptible child for retinopathy of prematurity

Answer 18

Born prior to 36 wk

Weight <1500 g

Question 19

Size of incision in

Conventional ECCE

SICS

phacoemulsification

Answer 19

10-12 mm

6-8 mm

<= 3 mm

Question 20

In how many days visual recovery occurs in

Conventional ECCE

SICS

phaco emulsification

Answer 20

2-3 mo

4-6 wk

Next day

Question 21

Glasses are prescribed after how many days

Conventional ECCE

SICS

Phacoemulsification

Answer 21

2-3 months

4-6 weeks

1 week

Question 22

Time duration for diagnosis of acute and chronic endophthalmitis

Answer 22

Acute 7 days

Chronic 4-6 week