The drug of choice for Pupillary condition as represented by an arrow shown in Photograph without cycloplegia is?
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.