To be eligible for the Diploma degree program at M.N. College of Optometry in Chennai, candidates must have completed their 10+2 or equivalent examination with a minimum of 50% aggregate marks in Physics, Chemistry, and Biology. Additionally, candidates must have a valid score in relevant entrance exams accepted by the college. Preference may be given to candidates with prior experience or certification in the field of optometry. It is also important for candidates to possess strong communication skills, a passion for eye care, and a commitment to ethical practices in the field of optometry.