The vulnerability of the ocular coat to trauma following radial keratotomy is an issue of concern to both patients and physicians. Herein, we report two cases of eyes which were exposed to severe trauma after previously...The vulnerability of the ocular coat to trauma following radial keratotomy is an issue of concern to both patients and physicians. Herein, we report two cases of eyes which were exposed to severe trauma after previously undergoing radial keratotomy procedures. In the first case, a woman sustained multiple facial bone fractures in a fatal airplane crash. In the second case, a man was involved in a case of blunt ocular trauma involving a high velocity racquetball. Rupture of the ocular coat did not occur in either case.
Standard concentric arcuate transverse corneal relaxing incisions flatten the meridian incised and steepen the meridian 90 degrees away, a phenomenon designated "coupling". We have demonstrated a new method of reducing t...Standard concentric arcuate transverse corneal relaxing incisions flatten the meridian incised and steepen the meridian 90 degrees away, a phenomenon designated "coupling". We have demonstrated a new method of reducing the steep corneal curvature without inducing coupling, by utilizing both transverse and radial components of an inverse arcuate incision. This technique has been found useful in cases of myopic astigmatism because it reduces the myopic spherical equivalent, which is left unchanged by standard arcuate incisions, without having to place radial incisions.
Krueger RR, Wang XW, Rudisill M
… +2 more, Trokel SL, McDonnell PJ
J Refract Corneal Surg
· 1994 · PMID 7517775
OBJECTIVE: To determine if excimer laser myopic ablation with a defocused laser image produces a smoother ablation profile than does focused laser light. METHODS: An ArF excimer laser was used to ablate a 5.00-diopter my...OBJECTIVE: To determine if excimer laser myopic ablation with a defocused laser image produces a smoother ablation profile than does focused laser light. METHODS: An ArF excimer laser was used to ablate a 5.00-diopter myopic correction in test blocks using both a contracting and expanding iris aperture. Defocused ablation was performed using a contracting iris aperture by translating the target away from the laser source. A confocal laser scanning microscope was used to analyze the surface smoothness at 55x and 275x magnifications. RESULTS: The confocal laser scanning micrographs revealed a series of sharply demarcated concentric ridges in the focused ablation, and less prominent, slightly wavy lines in the defocused ablation performed with a contracting aperture. The focused ablation with an expanding aperture also created concentric ridges toward the periphery, but with slightly smoother edges.
Rijneveld WJ, Beekhuis WH, Hassman EF
… +2 more, Dellaert MM, Geerards AJ
J Refract Corneal Surg
· 1994 · PMID 7517774
BACKGROUND: Intraocular lens implantation in eyes with pseudophakic or aphakic corneal edema and insufficient posterior capsular support presents a surgical challenge. The iris claw lens has the advantage that it can be...BACKGROUND: Intraocular lens implantation in eyes with pseudophakic or aphakic corneal edema and insufficient posterior capsular support presents a surgical challenge. The iris claw lens has the advantage that it can be fixated to the iris without sutures because the peripheral iris is incarcerated between the claws. METHODS: We present the results of a study with implantation of an iris claw lens in combination with penetrating keratoplasty in 19 eyes of 19 patients with pseudophakic or aphakic corneal edema which lacked posterior capsular support. The lens was fixated on the anterior iris surface (12 eyes) or posterior iris surface (seven eyes). RESULTS: Mean follow-up time was 11.8 months (7 to 21 months). All grafts remained clear. One patient was lost for follow up after 3 months. Visual acuity improved in 83% of the patients. Twenty-eight percent of the patients had a visual acuity of > or = 20/40. Complications such as pigment dispersion, glaucoma, peripheral synechiae, and lens decentration were rare. CONCLUSIONS: We feel iris claw lens implantation combined with penetrating keratoplasty is a safe alternative to achieve pseudophakia in eyes with corneal edema and inadequate posterior capsular support.