Ncle Advanced
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while others may be introduced to the lens surface by way of the patient's hands or tear film. 
Preservatives in care systems such as sorbic acid or potassium sorbate can cause lenses to discolor. 
Environmental contaminants such as make-up, newsprint and nicotine, can also discolor a soft contact 
lens. - ANSWER-72. Soft contact lenses may be discolored from coming in contact with many 
contaminants. Whid of the following would not discolor a soft cont act lens? 
A. Make-up 
B. Newsprint 
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