Question
The drug of choice for Pupillary condition as represented by an arrow shown in Photograph without cycloplegia is?
| A. |
Tropicamide.
|
| B. |
Edrophonium.
|
| C. |
Phenylephrine.
|
| D. |
Pseudoephedrine.
|
Show Answer
|
Correct Answer � C
Explanation
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|
Ans:C.)Phenylephrine
Mydriatics(Pupillary Dilator)
The commonly used mydriatics comprise two groups of drugs:
- Parasympatholytic, which cause pupillary dilatation and paralysis of accommodation by rendering the sphincter pupillae and ciliary muscles insensitive to acetylcholine.
- Sympathomimetic, which imitate or potentiate the action of adrenaline and produce pupillary dilatation but no cycloplegia. These drugs potentiate the action of parasympatholytic drugs.
- Phenylephrine:Produces mydriasis without cycloplegia within 20 minutes and lasts 3 hours. Particularly effective when combined with a parasympatholytic mydriatic.
- Ephedrine(5 per cent.) Produces mydriasis within 30 minutes, lasting 3 hours.
- Adrenaline:Very poor mydriatic when instilled into the normal eye, but a I : 1ooo solution will dilate the pupil of a patient with Horner’s syndrome.
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