An oculist, also known as an ophthalmologist, is a doctor who has had basic training in general medicine and surgery. Then he specialized in eye diseases. Eye strain and visual defects can often be associated with disease. He will consider all possible causes when performing an eye exam.
Doctors are the only ones allowed to diagnose and prescribe drugs for complete eye exams of children with a wide range of optometric services. After a thorough examination, if glasses are necessary, the doctor will write a prescription and take it to an optician for filling.
Anyone who believes he may have eye strain or has it, should investigate the matter thoroughly before consulting anyone who claims to be able to examine his eyes for free. These establishments are not welfare institutions, but businesses.
They do not charge for an eye exam, but make their money by selling glasses. People who might need glasses should be cautious about whom they consult.
There are also "eye specialists", who go on the road claiming to have a "newly discovered" method of correcting vision problems without glasses. They often offer a free lecture, but then collect the money.
These fakers charge a lot of money for lectures, books of instructions or other useless goods. These specialists are quick to jump at the chance to spread the "gospel", even if their fees start to drop.