To be an Optometrist you need to finish a doctor of Optometry. This takes 4 years to complete. To be a Pharmacist you need to have Doctor of Pharmacy. This practice takes 4 year, and also requires passing 2 exams. To become a Physician or surgeon need to meet demanding education and training requirements.They go through 4 years of regular undergraduate school , and four years of medical school and depending on their speciality, 3-7 years of internship.