Eye red streaks

My 10 year old son re-developed allergic conjunctivitis a few days back. JUST red streaks in his eye, pupils to outer corner in right eye. NO pain, itching, sensitivity to light, crusting, pus or anything.

LAST YEAR he had a similar episode that took 3 months to subside. Then, the first allopath misdiagnosed it as bacterial infection, then by the time it was properly diagnosed as allergic conjunctivitis, it took steroids, and a patient usage of a moisturizer eye drop and Sodium cromoglycate 2% Eye Drops for all to get stable. Recurrances a coupl eof times, went away with 2 days of drops.

On the homeo front LAST YEAR I tied pulsatilla on recommendation of a doctor on this post, that gave temporary relief before recurrence. Lack of follow up of that doc or anyone else to my further questions, led me to stop homeopathy.

THIS TIME, I looked up and have given him 3 doses of Belladonna - ';redness anywhere'criterion, twice a day for 2 days now - NOT much change at all.

Any advice for a cure will be much appreciated.