Sehtests

Sehtests are examinations that assess how well a person sees and whether there are problems with the eyes or the visual system. They evaluate aspects such as clarity of vision, the eye’s focusing power, eye coordination, and color and depth perception. Sehtests are performed by optometrists, ophthalmologists, or trained technicians and can occur in clinics, schools, or workplaces, and are often part of routine checkups, school screenings, or driving license procedures.

Distance visual acuity is usually measured with charts such as Snellen or ETDRS at a standard distance, with the patient wearing the appropriate correction if needed. Near vision is tested with smaller print or symbols. Refractive status is estimated using retinoscopy or autorefractors and refined through subjective refraction to determine prescriptions for eyeglasses or contact lenses. Other assessments include color vision testing (Ishihara plates), binocularity and depth perception tests, and tests of contrast sensitivity.

Health and function tests may include evaluation of the visual field (perimetry), pupil reactions, and examination of the eye’s interior and structures with ophthalmoscopy or slit-lamp biomicroscopy. These components help detect conditions such as glaucoma, cataracts, macular disease, or optic neuropathies, as well as binocular problems or refractive errors that affect daily activities.

Many Sehtests are adapted for age and context. Pediatric tests use symbols or preferential-looking methods for young children. In many countries, a Sehtest is required for certain licenses or epidemiological screenings. While informative, Sehtests do not replace comprehensive eye examinations for diagnosing eye diseases; persistent or unusual visual symptoms warrant professional evaluation.