General FAQ

How much visual acuity is required to pass the driving test?

The visual acuity of both eyes, uncorrected or corrected (with or without glasses or lenses), of 0.8 (80%) in total, provided that one eye has a vision of at least 0.5 (50%) and the visual field is normal, is considered legally adequate visual acuity for operating a motor vehicle. If a person has only one eye, then the visual acuity of that eye, uncorrected or corrected, must be 1.0 (100%) with a normal visual field in order to be issued a driver’s license.

Can stress affect the diopter change?

Your problems with focusing, dizziness, and headaches may be due to inadequate diopters or disorders of fusion (merging images) as a result of latent strabismus, especially during periods of intense studying or reading.

Astigmatism, like diopters that are not sufficiently corrected, or are over-corrected, can create certain problems (blurred vision, headaches, dizziness).

Stress itself cannot increase diopters, but it can reduce the body’s overall compensatory abilities, including the ability of the individual to somewhat reduce their uncorrected or insufficiently corrected diopters through the effort of their accommodative eye muscle.

What does a general ophthalmological examination consist of?

  • Determining natural visual acuity (visual acuity without diopters)
  • Determining diopters and checking visual acuity with diopters
  • Measuring tear levels in the eye
  • Measuring eye pressure
  • Examining the anterior eye segment on a biomicroscope
  • Examining the posterior segment of the eye with dilated pupils

What is a cylinder?

A cylinder is a type of lens used in the correction of astigmatism. As astigmatism is a diopter only along one axis (either plus or minus), it is necessary to correct this diopter only along the same axis. Therefore, a lens that corrects the diopter only along one axis is called a cylinder. It is actually a longitudinal cross-section of a cylinder. Lenses that correct plus are convex lenses (cross-section of a sphere), and minus are concave lenses (they have a depression).

How to prevent diopter growth?

The increase in diopter is genetically determined and there is no specific way to prevent it. Some theories suggest that prolonged near work (computer, studying) can accelerate the increase in diopters in people who are predisposed to some form of diopter.

Are there vitamins for the eyes?

Yes, there are. We recommend taking eye vitamins for people who have degenerative changes at the back of the eye (these are changes usually associated with aging or some eye diseases like high myopia or hereditary diseases of the macula). In these cases, vitamins are either an additional therapy along with the basic treatment, or the primary treatment aiming to at least slow down the decay of cells. Vitamins have a protective effect against harmful metabolic compounds.