You are right about the side effect of Xalatan being change in color of the iris
( heterochromia) but this is not seen compulsorily in every individual on this medicine. There are other side effects too such as elongation of the eyelashes ( megalotrichiasis) but again not seen in everyone.
Timolol maleate eye drops can have less severe side effects such as stinging,allergy to the medicine,dryness
. Being a non-specific beta blocker, it is to be used with caution in those with bronchial asthma, cardiac problems as it can sometimes have systemic side effects in such individuals.
Please feel free to ask follow up questions if any.
Thank you and best wishes.
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Views expressed are for information purpose only and cannot substitute a visit to an ophthalmologist