silver
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45 yo woman with long history of progressive myopia develops sudden patchy loss of vision in her right eye. She is very worried and rushes to her family doctor. Funduscopic examination reveals a large retinal detachment in the right eye. The retina in the left eye is normal. When the pupillary light reflex is is tested by swinging a light from her left eye to her right eye, the physician would likely note which of the following?
A. Constriction of the right pupil and constriction of the left
B. Constriction of the right pupil and dilatation of the left
C. Dilatation of the right pupil and constriction of the left
D. Dilatation of the right pupil and dilatation of the left
E. No reaction of the right pupil and constriction of the left
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| new_n_lost
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Look into her eyes and say...... If you let me in its a win -win situation.
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| silver
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new_n_lost wrote:
Look into her eyes and say...... U CANT BE SERIOUS DAMN I M GONNA GET LUCKY TONIGHT
...and now back to the question nnl! 
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| seem.bh
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c. dilatation of right pupil n constriction of left pupil....
bcoz marcus-gunn pupil
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| Tiff
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Think I've seen this before. Is it E?
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| new_n_lost
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yup a possible Marcus Gunn pupil will be there
so D. Dilatation of the right pupil and dilatation of the left
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| sen
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D, dilatation of right and left pupil
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| Tiff
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Why does it dilate?
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| drgho
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D. Agree..
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| new_n_lost
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Tiff wrote:
Why does it dilate?
In Marcus Gunn pupil the affected pupil doesnt percieve light to be that strong so the constriction is less then normal eye. Therefore when swinging light from normal eye to affected the lesser degree of constriction makes it appear that the pupils are dilated.
In other words the when the light is shone in the normal eye both pupils constrict and when the light is shone on the affected eye both pupils also constrict but to a lesser degree thus make it appear as if they are dilating in comparison.
I hope i have explained well 
Edited by new_n_lost on 01/29/08 - 11:09 AM. Reason: Horrendous Grammeritcal Mistake on my part !!
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| Tiff
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Thanks NNL for the explanation. It's a bizarre mechanism, but I think I get it. 
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| paheli
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I picked this qn to attempt for a totally different reason........yep, Valentine's Day is around the corner, and yours truly is lonely..........
And, before I forget, the answer is D.
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| silver
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CORRECT ANSWER: D
The patient is exhibiting Marcus-Gunn phenomenon.
When light strikes the retina, the pupillary light reflex is automatically triggered, leading to simultaneous constriction of both pupils. In the absence of adequate light entering the eye, for example following retinal detachment or optic neuritis, paradoxical dilatation of the pupils occurs. The retina receives far less light than it normally would, and the pupils dilate in order to absorb as much light as possible.
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| seem.bh
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hmmmm i got the mechanism rite but answer wrong..this is wat i do i do... i shd not repeat this again....mayb i shd look into her eyes again:P
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| silver
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| new_n_lost
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seem.bh wrote:hmmmm i got the mechanism rite but answer wrong ..this is wat i do i do ... i shd not repeat this again....mayb i shd look into her eyes again:P
Damn this sucks cos now if a woman cant understand a woman then we men are totally screwed !!
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| seem.bh
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AHAH! THR IS NO RULE THT A WOMAN SHD UNDERSTND A WOMAN!!
n i was talkin abt my answer whr i made a mistake!!..doesnt tht desrve sum consideration??
new_n_lost wrote:
Look into her eyes and say...... U CANT BE SERIOUS DAMN I M GONNA GET LUCKY TONIGHT
u already had ur chance with ur lucky nite??
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| new_n_lost
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seem.bh wrote:AHAH! THR IS NO RULE THT A WOMAN SHD UNDERSTND A WOMAN!! n i was talkin abt my answer whr i made a mistake!!..doesnt tht desrve sum consideration?? new_n_lost wrote:
Look into her eyes and say...... U CANT BE SERIOUS DAMN I M GONNA GET LUCKY TONIGHT u already had ur chance with ur lucky nite??
Roflmao
Now if you women cant understand each other then dont blame us men for not being understanding and all because ya all cant understand each other Therefore the theory that women are often difficult to understand proves right.
Do u actually think i got lucky cos if i had then my final response would not have been.
new_n_lost wrote:
Look into her eyes and say...... If you let me in its a win -win situation.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| seem.bh
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to nnl
hmmmm...wel let me first get this straight??? Y DO I HAVE TO UNDERSTAND A WOMAN HERE??
i made a mistake by not lukin at her eyes coz i got distracted.. is tht my fault now if sumone very politely says luk into my eyes i was tryin to .... n ur theory of not being able to understnd a woman is WRONG MY FRND.....coz women aint tht complicated..its just tht most men r too dumb/iidoits to understand how smart v r ..tehy don match our IQs
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| silver
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to seem.bh,
let's hope we don't get "distracted" during the exam
best part is at least we know what mistakes we're making and we'll be ready for the real deal.
sometimes i do the same thing as you--right answer, wrong reasoning....gotta fix it!
GL
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Everything turns out ok in the end. If it's not ok, then it's not the end.
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| seem.bh
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let's hope we don't get "distracted" during the exam
best part is at least we know what mistakes we're making and we'll be ready for the real deal.
sometimes i do the same thing as you--right answer, wrong reasoning....gotta fix it!
GL
..i know i agree with u silver...
wel thank u...n heyyyyyy gud luck to u too
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