Eye doctors recommend an annual investigation, an investigation but at least every three years. Also, who operates already eye care through proper nutrition and avoiding stress, such as cigarette smoke, improper work on the computer screen, not enough sleep, dry heating air and draughts, may not waive the despite all regular examinations by the ophthalmologist. Eye doctors recommend an annual investigation, an investigation but at least every three years. So a study includes a measurement of intraocular pressure (tonometry) and an eye test. A measurement of the internal pressure of the eye is called the green stars, even glaucoma screening. The eye pressure or intraocular pressure or medical tensio is the physical pressure on the inside wall of the eye. Through him the distance between the cornea, lens and retina remains the same the corneal surface consistently smooth curved, getting the orientation of the photo receptors on the retina evenly and the spherical shape of the eyeball. The intraocular pressure is regulated by the water of Chamber of, It is formed by the epithelium of the ciliary body.

It passes through the pupil into the anterior Chamber of the eye, where it again flows out on the trot disgust work of the Chamber angle through the blood channel into the venous system shunt between IRIS and lens of the eye. The intraocular pressure thus arises from the relationship between inflow and outflow of the water of Chamber. If the intraocular pressure is increased, because there is a mismatch between the inflow and the outflow of water of of Chamber of, which damages the optic nerve. This can lead to visual disturbances such as field failures up to total blindness. In the early stages, the Green star causes no pain. Therefore, a regular measurement of intraocular pressure for early detection is vital. The normal intraocular pressure is between 10 and 21 mmHg.

For the measurement, there are different procedures, which are all covered by the term tonometry. Nowadays the intraocular pressure is for a defined mechanical flattening usually either with a month after Goldman determined, where the force is measured, the anesthetized cornea is necessary, or he determines where the flattening of the cornea is measured by a puff of air with a non-contact measurement by means of non-contact tonometry. An additional older method is the Impressionstonometrie, where with a Schiotz Tonometer is checked and how deep a metal PIN through a precisely defined weight eindellt cornea. Because the intraocular pressure in the course of the day can vary, multiple, distributed over the day measurements may be required to create a so-called day-pressure profile. In addition to the measurement of the internal pressure of the eye, the eye doctor makes an eye test, which verifies the Visual acuity of the eyes. It verifies both near vision (for example to read) and views (such as driving a car). While the patient reads characters from a Panel. If the patient can not properly recognize especially the smaller characters, the eye doctor decide whether the eye care in this case includes wearing a pair of glasses.