hi,

see An ophthalmologist is a medical doctor  or professional who specializes in eye and vision care. Ophthalmologists are qualified to  perform eye tests, diagnose and treat disease, prescribe medicines  and perform eye surgery. They also give suggestions  for spectacles  and contact lenses. however the two of the branch like ophthalmology and orthopedics both are different and have equal demand in social life. Our society can not survive with out any of the professionals of ophthalmologist or a orthopedics doctor.

hope you understand.