Dear students,
I am posting the Ophthalmology questions from AIIMS 2020, June with answers and short explanations.Since these are questions recalled by students, there may be discrepancies in the questions and options.My apologies for the same.
Question 1: Tough one
If numerical aperture of objective lens in an operating micocope is increased then
1 Contrast increases
2 Magnification increases
3 Resolution increase
4 Height from where work can be done increases
Answer:Numerical aperture is related to resolution of the microscope, hence answer should be 3
Question 2: Easy, common sense question: AIIMS
Nurse has to give eye ointment and eyedrop to a patient. How to give
1.Eye ointment followed by eye drop immediately
2.Eye ointment followed by eye drop after 15 min
3.Eye drop followed by eye ointment immediatley
4.Eye drop followed by eye ointment after 15 min
Answer:The answer is 4
Ointment has an oily base and hence may impair the absorption of the eyedrop.So eye drop first, then ointment after 15 minutes.Obviously, we never instill 2 topical drugs simultaneously
Question 3: Slightly ambiguous, has 2 correct options : AIIMS
About cornea following are true except
1.Has microvilli
2.Bowmans membrane has regenerative potential
3.Decreased mitotic activity near limbus
4.Stratified squamous epithelium
Answer:I am not sure if the recalled options are correct.But if these are the given options, 2 and 3 are untrue.
Bowman’s membrane does not have the potential to regenerate.
The limbus has the stem cells and hence maximum mitotic activity is seen there
Question 4
Best formula for IOL power calculation post LASIK
1.SRK II
2.Haigis L
3.Hoffer Q
4.SRK T
Answer is Haigis L which is one of the formulae used for IOL power calculation in eyes post refractive surgery.The rest of the formulae given in the options cannot be used post refractive surgery
Question 5
A small pupil which does not increase in size in darkness
1.Argyll Robertson pupil
2.Horner’s syndrome
3.Blind eye
4.Adie’s tonic pupil
Answer:According to me, the answer should be Horner’s syndrome.
Blind eye and Adie’s pupil have dilated or large pupil and are automatically excluded.
Argyll Robertson has a small pupil but it is typically an example of light near dissociation.
Horner syndrome presents with small pupil and inability of the pupil to dilate in the dark due to sympathetic palsy.Hence, I think it should be the answer
Question 6
A patient present with left head tilt.He has left hypertropia/ right hypotropia which worsens on dextroversion and right sided head tilt.What is the diagnosis?
1.Right SO palsy
2.Right SR palsy
3.Left SO palsy
4.Right IO palsy
Answer:If the questions and options are correct, answer is Right SR palsy.
Right SR palsy presents with right hypotropia/ left hypertropia as right SR is an elevator of right eye.
This right hypotropia increases on same sided gaze and same sided head tilt: dextroversion and right head tilt.
Hence patient tilts head to the left
Question 7
Which if these drugs causes field loss?
1.Phenobarbitone
2.Vigabatrin
3.Ethosuximide
4.Levetiracetam
Answer:Answer is Vigabatrin which causes bilateral peripheral visual field loss