Technician, nurse, doctor, optician, optometrist. Risks and precautions None. No changes necessary. No changes necessary. No changes necessary.
Discomfort disappears when the test is finished.
E chart showing the letter E in various positions and sizes. Chart is used for younger children and people who can't read. Disposable tissues or disposable eyepatches. Both eyes are tested with and without corrective lenses. Cover one eye, then the other.