The visual defects that prevent the human eye from seeing clearly are also known as refraction defects or refraction errors.
Refraction defects arise from an inadequate optical projection of the light within our eyes. The light rays from the outside are unable to focus on the retina, but rather they meet in the area in front of the retina. This is termed myopia; alternatively, the rays come to a focus beyond, i.e. behind, the retina: this is termed hypermetropia.
To correct myopia, hypermetropia, astigmatism and presbyopia SERI Lugano offers different “no-touch” interventions. These may be defined as “non-surgical” because they do not use scalpels, blades, sharp edges or surgical instruments on the corneal surface (the Femtolasik Lux® and the Pinelli Presby Profile®, for example) or as intraocular interventions to remedy visual defects, or when there is also a cataract (lensectomy for refractive purposes or phakic lens implantation).
Find out below what your visual defect entails and the best ways to resolve it!
The individual can see clearly at a distance convenient for reading, but fails to see distant objects without glasses or contact lenses
This visual defect is due to the asymmetrical curvature of the cornea. Light rays from an object are not refracted on the cornea in the same way, and the ability to focus varies at different points. Astigmatics have difficulty focusing both distant and near objects.
This is the opposite of myopia: the curvature of the cornea is too slight and this causes the images to become focused behind the retina. Consequently, even at a young age, distant vision is clear, but objects placed near the eye are blurred.
This physiological condition occurs with aging. It happens when the crystalline lens (the lens of the eye, which is responsible for focusing) thickens and gradually becomes resistant to the mechanism of accommodation.