Our Eye-Surgery Center Lohr is
certified by the German
DIN EN 9001:2015
Applicability - Which procedure is right for you
We perform all variations of laser vision correction and additional surgical methods, as ICL and RLE too. So, during your initial examination, we will talk to you, obtain measurements of your eyes, and determine which procedure is the best for your specific situation. Lasik is often our procedure of choice. Patients greatly prefer the Lasik procedure in terms of rapid vision recovery and decreased pain. The vision recovery with LASIK is so rapid that most of our patients return to their normal day-to-day routine the very next day.
What causes imperfect visual acuity?
Not all things are perfect. Perfect eye sight is the result of a number of factors that must coincide in an optimal way: the curvature of the cornea, the power of the lens, and the length of the eye. When these elements are correctly proportioned or arranged, light is properly focused on the retina and one experiences good vision. If not, as is the case for a large percentage of the world’s population, then one is said to have a refractive error.
Emmetropia (perfect eye-sight):
The normal eye is a perfect sphere, where the cornea and lens focus light to form an image on the back, inside surface of the eye, known as the retina. When a distant object is imaged, the lens is relaxed and the image falls exactly on the retina. Moving the object closer, the lens has to accommodate to keep the image sharp.
When the image of a distant object falls in front of the retina, the person is said to be myopic. This could be due to abnormal changes by the refractive objects in the eye or, more commonly, by an eye that is too long. The total refracting power of the eye must be reduced, either by placing a negative lens in front of the eye or by a surgical procedure which alters the shape of the cornea so that it is less refracting. The optical power will be chosen so that the image of a distant object falls on the retina without any lens accommodation.
For a farsighted eye, the optical power is not enough to focus the rays from a distant object on to the retina. The image, when the lens is relaxed falls behind the retina due to a shortened axis. By accommodation, distant objects are possible to focus, but for closer objects, the lens accommodation is not enough. A positive correction lens is needed to assist the lens to focus rays onto the retina.
Astigmatism comes from an uneven curvature of the cornea. This means that light coming in different planes will be refracted differently resulting in different focal distances. Rays in one meridian plane may be focused in front of the retina while rays in another meridian plane will be focus on the retina. This means that by observing for instance a checkerboard, the horizontal rows can be in focus while the vertical lines are blurred.
As we grow older, the eye gradually loses the ability to change focus from distance to near. This is a gradual change and it is usually not noticeable until the mid-forties. This condition is called presbyopia, and it makes reading and other close work increasingly difficult. As this occurs, people who have been nearsighted or farsighted begin to wear bifocals. People who have never worn glasses begin to wear reading glasses for close-up work. This condition cannot be corrected without any glasses by excimerlaser procedures.
Animations to refractive errors
Here you can view video clips on the above vision problems