Myopia, hyperopia or presbyopia - eye experts use plenty of Latin vocabulary to describe visual challenges. As a patient, do not let the language confuse you, because all of these medical terms simply refer to a wide variety of vision impairments.
In plain English, myopia is called nearsightedness, hyperopia farsightedness and presbyopia refers to age-related vision impairments. More than half of the population struggles with one or the other imperfection when it comes to visual acuity. A vision test determines the actual condition instantly. As a result, appropriate eyeglass lenses can be prescribed and perfect vision restored.
How does presbyopia develop?
The root cause of this vision problem has been determined: As we age, the content of water in the eye’s lens diminishes, while the insoluble protein content increases. As a result, the lens becomes stiffer and loses its elasticity. Consequently, it can no longer bend as much as it needs to for the human eye to be able to see clearly up close.
Presbyopia begins to develop around the age of 45. In the early stages, only minimal corrections of about +0.75 diopters are required. As the years pass, the accommodation strength continues to decline. The process is usually complete after the age of 60 and the impairment remains at the same level.
How spectacle lenses correct presbyopia
Once the patient’s visual acuity has been determined, this visual impairment can be compensated with a variety of lens options. Patients, who were previously blessed with normal vision, will need reading glasses with concave lenses. Depending on the close up strength, these glasses have to be taken off during some close-up work, for instance while working on a computer.
The situation of people who were previously nearsighted or farsighted is a little more complicated. Nearsighted patients need reading glasses with weaker diffusion lenses. Farsighted patients are prescribed stronger concave lenses and reading glasses. Because most users do not like having to constantly switch between eyeglasses, most people who are farsighted will opt for varifocal lenses.
In addition to covering both long- and short-range vision issues, they also have a corrective zone that allows users to see comfortably at medium-range distances. Varifocal lenses Varifocal lenses provide seamless transitions from near to far. In fact, they emulate our natural vision patterns. Modern glasses are so easy to get used to that the familiarization periods are now amazingly brief.
And what does this mean for people who wear sunglasses?
We'll tell you what happens when your eyes have to work too hard
What's important for tailor-made glasses? Knowing how a patient's eyes interact.
They changed the world with their ideas
The ZEISS Vision Science Lab at the University of Tübingen in Germany carries out fundamental research into vision