Ruling on prostrating when wearing glasses

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.