Hey,

Cardiology and optometry both are good courses, it is depend upon your interest that what you like. And for your other question, you cannot be a doctor after your bachelor course or b.sc cardiology to become a doctor you have to complete you MSc cardiology and the MD Cardiology to become a Cardiologist. Who are a specialized doctor in cardiology.

Top colleges for MSc cardiology:-

• Manipal University
• D Y Patil University
• Parul University
• AIIMS

Top MD colleges for MD :-

• University of Hertfordshire
• Brighton ans sussex medical school
• National Institute of Ireland