Talk to Eye Specialist on Left Eye Problem

I occasionally wear contact lenses . I wore it last weeek and a free sometimes my left eyes turned red so I immediately remove it. After the whole next day my left eye remained red . I didn't get that whether it's an infection or it was something temporary. But whenever I wear contact lenses my left eye trend red but I never feel itching or uncomfortable . I'm worried like I saw video on fb regarding contact lenses in which red eyes or infections leads to a complete blindness. Kindly enlighten me with some knowledge