• Opthamologist is higher education after MBBS degree.
• Ophthalmology is a branch of medicine and surgery which deals with the diagnosis and treatment of eye disorders.An ophthalmologist is a specialist in ophthalmology
• To become Ophthalmologists you have to first complete MBBS (Bachelor of Medicine and Bachelor of Surgery) course and then go for the postgraduate degree in ophthalmology like MS (Master of Surgery), MD (Doctor of Medicine), etc.

Greetings,

Ophthalmology is a post graduation field under MS. During MBBS almost everything is touched upon in general but only during your PG studies would you choose a branch like ophthalmology (eye specialist) to study in depth and become a full fledged doctor in. To go that way you you will need to clear the NEET- PG exam and get good enough rank as these branches of MS are pretty sough after and hard to get (less seats, more competition, etc.)

best of luck if you plan on going that way, here is a link for more info on NEET PG:

https://medicine.careers360.com/exams/neet-pg

hope it helps.