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Impressum
Laser thermal keratoplasty (LTK) for the correction of low to moderate hyperopia
Kohnen T.
Universitätsaugenklinik Frankfurt/Main, Theodor-Stern-Kai 7, 60590 Frankfurt/Main
To correct hyperopic refractive errors corneal coagulation (laser thermal
keratoplasty) may be used to heat and shrunk peripheral corneal tissue
which produces a central corneal steepening. Histological and ultrastructural
examinations have shown superfical epitheal lesions, injury of keratocytes
and stimulation of a circumscripted wound healing response after LTK.
Mainly type I collagen (procollagen) is produced. In 100 eyes of 92 patients
a noncontact Holmium:YAG LTK (Sun 1000, Sunrise Technologies, CA, USA)
was performed and patients were followed for 2 years. The application
of two laser rings (each with 8 octagonal located laser spots, diameter
600 µm) in a radial fashion on the 6- and 7 mmcorneal zone achieved
in patients older than 40 years up to +3.0 dpt of correction. Disadvantages
of the procedure are initial overcorrection and regression over time.
LTK is an easy, safe and quick treatment modality for presbyopic hyperopia
(up to +2.5 dpt) for the patients as well as for the physician.