Is the use of coloured lenses allowed if proper Hijab is being observed?
Praise be to Allah, the Lord of the Worlds; and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
Using coloured contact lenses is permissible as long as they do not cause any harm for ones eyes, and as log as they are not used for deceiving or cheating people.
Finally the objective for using them should not be to imitate the
non-believing women.
Allah knows best.
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