Ruling on prostrating when wearing glasses
Question

                As a muslim,are we allowed to perform our salaat while wearing coloured contact lens? or glasses?.
Praise be to Allah.There is nothing wrong with 
    praying when wearing coloured contact lenses or glasses, unless the glasses 
    prevent the worshipper from placing his nose or forehead firmly on the 
    ground when prostrating. In that case he has to take them off before he 
    prays or when he prostrates. 
Al-Bukhaari (812) and 
    Muslim (490) narrated that Ibn ‘Abbaas (may Allaah be pleased with him) 
    said: The Prophet  (peace and blessings of Allaah be upon him) said: “I 
    have been commanded to prostrate on seven bones: the forehead” – and he 
    pointed to his nose – “the hands, the feet and the ends of the feet (i.e., 
    toes)”  
Shaykh Ibn ‘Uthaymeen (may 
    Allaah have mercy on him) was asked about the person who wears large 
    glasses, which prevent him from being able to prostrate fully on the seven 
    parts of the body. 
He replied: 
If they prevent the end of 
    the nose from reaching the ground when prostrating that is not acceptable, 
    because what is carrying the face in this case is the glasses, which are not 
    at the end of the nose, rather they rest on the bridge of the nose. Based on 
    this, the prostration is not valid. The one who wears glasses that prevent 
    him from placing his nose in the place of prostration has to take them off 
    when prostrating. End quote from Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen 
    (13/186). 
And Allaah knows best.