Determination of visual acuity (visometry)

Visual acuity testing (visometry) is a standard ophthalmological procedure used to assess the eye’s ability to distinguish details of objects at different distances. The examination helps diagnose refractive errors such as myopia, hyperopia, and astigmatism, and allows selection of the most appropriate method of vision correction.

When is visual acuity testing required?

• Reduced image clarity, blurred vision, or indistinct outlines of objects.
• Eye strain and headaches after visual load.
• Double vision, difficulty reading or working at near distances.
• Need for prescription of eyeglasses, contact lenses, or consideration of laser vision correction.
• Routine screening of children, adolescents, and adults to monitor eye health.

How is the examination performed?

1. Distance vision testing. The patient reads letters or symbols on a standard eye chart (e.g., Snellen-type chart) positioned at a distance of 5 meters.
2. Near vision testing. Special near-vision charts or texts are used at a distance of approximately 30–40 cm.
3. Testing with correction. If visual acuity is reduced, the test is repeated using trial spectacle lenses or contact lenses.
4. Instrument-based assessment. In some cases, computerized autorefractometry is performed to objectively measure the eye’s refractive power.

Diagnostic methods

• Visometry. Assessment of the eye’s ability to recognize optotypes at various distances.
• Autorefractometry. Computer-assisted measurement of refractive error.
• Phoropter-based testing. Stepwise selection of lenses with different diopters to determine optimal correction.

What to do if visual acuity is reduced?

• Use appropriate optical correction (eyeglasses or contact lenses).
• Perform preventive eye exercises as recommended by an eye care specialist.
• Avoid prolonged visual strain and ensure adequate lighting.
• Consider laser vision correction in cases of significant refractive error.

Advantages of diagnostics in modern ophthalmology centers in Belarus

• High-precision equipment allows detection of even minimal changes in vision.
• A comprehensive approach includes not only vision testing but also screening for underlying ocular diseases.
• Selection of effective vision correction methods, including customized lenses and surgical options.

In Belarus, visual acuity testing is performed in modern ophthalmology clinics equipped with advanced diagnostic systems. Experienced specialists accurately determine visual function and help select the most appropriate method of vision correction.