Hello Nibin,

It is totally depends upon your choice or in that subject you have deep knowledge and interest so that you can score good marks in that subject and then you will become an expert of that field.

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All the best.

Hello, 

Optometry is a satisfying career in medical courses in various ways. It is a dynamic and challenging career that offers self-awareness, work flexibility, community respect, money related achievement & unlimited opportunities.
A career in optometry offers a high salary, job stability, tremendous potential for development and a decent work environment

Hope this helps...