Hello Kusum hope you are doing well !

As , I'm seeing your questions on this particular question let me clear your doubts,

So , if you are thinking of doing diploma in optometry then , It is a two-year course. To pursue this course you has to complete 10+2 with Physics, Chemistry, Biology & English.

Now , If you want to pursue with PCM  , Bachelor of Optometry which many colleges of Chattisgarh offers also (As in previous question you asked about this particular state),

The duration of this courses is 4 years.

To be eligible for this courses you has to complete H.S.C./10+2 or equivalent examination with Physics, Chemistry, Biology/ Mathematics and English.

Hope it helps and clears all you doubts!