If you have problems with your eyesight, the optician is usually the one you first come to know. The vast majority of problems can be related to visual defects that can be solved with glasses. If an eye disease is suspected, the authorized optician has an obligation to refer to an ophthalmologist.
Where the optician primarily takes care of glasses, contact lenses and low vision optics, the ophthalmologist treats eye problems that are caused by medical conditions that can be treated physically or operatively.
Direct referral to ophthalmologists is mainly done by GPs or opticians. You can also come straight from the street, for example, if suddenly there is visual difficulty, pain, red eye and affected eye conditions.
How is the view measured?
Since eyeglass measurement is time consuming, most ophthalmologists no longer make eyepiece determination, except for children under 10 years of age. Opticians therefore perform most of the samples.
The measurement takes place in a specially designed test room, using an advanced device with changing optical lenses, as viewed through a tablet of numbers or numbers of varying sizes (Snellingsplaten).
Different tests are performed to measure the visibility of the eyes and reveal refractive errors such as: long, short sightedness, size and direction of a building defect (astigmatism). Also visible visual or minor disorders in the positions of the eyes can be revealed through tests. Testing of the sight is usually performed at both distance and at short distance.
The optician can also perform additional studies, such as pressure gauge, field of vision or photography of the retina to screen the eyes for any abnormalities. Approximately every tenth of the optician’s examinations lead to an eye doctor or other doctor.
In order to determine the location of the glasses in the spectacle frame, you also measure the distance between the eyes (PD).
The visual test alone does not express a true fact – the final spectacle strength is determined on the basis of an overall assessment of the measurement results. Also the requirements, such as the individual’s job, make sense for the overall assessment.
In relation to the overall assessment, it is therefore important that the optician / ophthalmologist should be informed of complaints and anything else that may be relevant to the investigation. In addition, it is important that you are obvious and try to answer as accurately as possible during the test.
Visibility and visual disturbance
The eye’s visibility (visas) is an expression of its ability to distinguish details. For example, the ability is indicated by 6/6 (6 meter distance achieved), which thus expresses a good normal viewpoint, whereas 6/60 indicates a reduced vision (weakness).
If you have long vision (hypermetropy), you need a lens edger of positive strength (convex lens). If you are near vision (myopia) you need a minus glass (concave glass). If you have building faults (astigmatism) – so-called “crooked corneas” you need specially cured glass.
Binocular field of vision
The eyes ‘ability to cooperate (consensus) is dependent on the relationship between the eyes’ fixation plan and the sharpening point that must be within a relative margin. Deviations in this function may cause impaired reading or visual impairment in special work situations. Performance of conscience is offered privately by opticians.