According to sharia if wearing contact lenses does not pose any medical harm, then there is no objection to wearing them. However, wearing contact lenses merely to follow in the footsteps of others or with the intention to deceive someone (about the colour of the eyes) is not appropriate at all.
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دلائل:
الأشباہ و النظائر: (252/1)
الأصل فی الأشیاء الإباحۃ حتی یدل الدلیل علی عدم الإباحۃ ۔
Allah the Almighty knows best.
Darul ifta Al-Ikhlas, Karachi.