Hallo Tom,
ich will auch immer schlüssige Erklärungen und google dann, bis ich etwas Plausibles gefunden habe. Meist ist es auf nicht-deutschen Websites.
Hier eine Erklärung in Englisch, was das Ghosting hervorruft. Sie scheint mir plausibel (v.a. die gefettete Passage).
Laser surgery can produce higher order aberrations
Higher order aberrations are symptoms that occur quite commonly in people of old age. The most common types are:
• Halos - a glowing ring is seen around light sources.
• Starbursts – rays of light radiate out from a light source, like a star.
• Ghosting or Double Vision – you can see two of every object.
Studies have shown that having laser eye surgery (most predominantly LASIK) can induce these problems, with approximately 5-10 people per 1000 exhibiting these symptoms.
These higher order aberrations tend to occur mostly at night or in darkened rooms such as cinemas. It is thought these problems are caused either as light hits the boundary between the corrected and non-corrected parts of the cornea, or the place where the flap was cut. This leads to light ‘scattering’ into the eye, producing the image of rays or a halo. During the day when it is bright, the pupil constricts and prevents any of this ‘scattered’ light from entering the eye, however at night when the pupil dilates these problems become more evident. People with larger pupils are thought to be at an increased risk of developing higher order aberrations post correction. This is why procedures such as wavefront LASIK that make thinner cuts are advocated.
These visual defects can be very debilitating and may prevent you from watching the TV at night, going to the cinema and even driving. They usually cannot be corrected.
Quelle:
http://www.healthcentre.org.uk/laser-ey ... rgery.htmlLass Dich nicht kirre machen vom letzten Satz („Diese können normalerweise nicht korrigiert werden.“). Bei mir sind die Geister vorübergehend gewesen, und ich habe mir das so erklärt, dass die Hornhaut über der Ringkontur des Flapschnitts („Gullydeckel“) nachgewachsen war und sich diese minimale Fuge wieder verschlossen hat. Damit entfällt auch das Streulicht, das die Geister hervorruft.
Wie schon anderswo erwähnt: Ich bin keine Medizinerin, aber ich habe eine für mich nachvollziehbare, logisch erscheinende Erklärung gefunden. Und das hat mich dann beruhigt.
Gruß
Pani