India, Feb. 12 -- Gaurav Khanna is a contestant on the cooking reality show Celebrity MasterChef. In a recent episode, the Anupamaa actor revealed while preparing a dish that he was colour blind. Colour blindness, also known as colour vision deficiency, is a condition in which a person has difficulty perceiving certain colours, usually red, green, or blue. Also read | Woman with colour blindness documents struggles of daily life. Watch

"Many don't know this; I am colour blind," Gaurav said on the show. Not just Gaurav, many celebs such as actor Eddie Redmayne, singer Sting, as well as Facebook CEO and founder Mark Zuckerberg are colour blind.

Did you know colour blindness is more prominent in men due to the genetic basis of the conditio...