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J C Casebeer

Publications and source records attributed to J C Casebeer.

At least 19 recordsLinked to original sources
PubMed1998

Outcomes of spherocylinder treatments in the comprehensive refractive surgery LASIK study.

The CRS LASIK Study is a surgeon-sponsored collaborative project to evaluate LASIK outcomes with the Summit and VISX lasers. The current report includes 3-month outcomes in the first group of patients who underwent spherocylindrical corrections of 1 to 10 diopters of myopia and 1 to 4 diopters of astigmatism with the Summit Apex Plus and VISX Star lasers. Cohort selection criteria were applied to select 911 eyes that underwent surgery between April 1, 1996 and October 1, 1997 in the range of study. Eyes with preoperative best spectacle-corrected visual acuity of worse than 20/40 (0.5) were excluded. Outcomes were stratified according to myopic treatment range. One day uncorrected visual acuity was 20/40 or better in 83% of eyes with both lasers. At 3 months, 20/40 uncorrected acuity was found in 93% of Summit and 90% of VISX eyes in the -1.00 to -4.00 D group, in 88% of Summit and 84% of VISX eyes in the -4.01 to -7.00 D group, and in 67% of Summit and 70% of VISX eyes in the -7.01 to -10 D group. Three-month manifest refractive outcomes in the -1.00 to -4. 00 D group were within +/- 1 D of target in 91% of the Summit eyes, and 89% of the VISX Eyes. In the -4.01 to -7.00 D range, 72% of the Summit eyes and 74% of the VISX eyes fell within +/- 1 D, and in the -7.01 to -10 D range, the rates were 53% for Summit and 56% for VISX. No eyes lost two lines or more acuity with either laser. Three-month visual and refractive outcomes in LASIK are comparable with the Summit Apex Plus and VISX Star lasers. Loss of BSCVA of two lines or more was not seen. CRS LASIK Study protocols are ongoing to provide longer follow-up and to study other refractive indications.

Adult↗
PubMed1996

One-year results of a prospective multicenter study of the Casebeer system of refractive keratotomy. Casebeer Chiron Study Group.

PURPOSE: To evaluate the clinical results, predictability, stability, safety, and the patient satisfaction after refractive keratotomy for the correction of myopia and astigmatism using a defined protocol (the Casebeer system). METHODS: The authors enrolled 324 patients (615 eyes) in a prospective study conducted by 18 surgeons. All procedures were performed using ultrasonic pachymetry with the diamond knife blade set at a length of 100% of the temporal paracentral corneal thickness reading and four to eight centripental (Russian style) incisions with or without fixation of the globe. Straight transverse incisions were done for astigmatism in 222 (36%) eyes. One to eight repeated operations (enhancements) were done on 241 (39%) eyes. RESULTS: Mean baseline cycloplegic refraction was -3.68 +/- 1.59 diopters (D) (range, -0.88 to -8.25 D). One-year data were available for 546 eyes (89%). At 1 year, mean spherical equivalent cycloplegic refraction was -0.27 +/- 0.78 D (range, -3.13 to +3.00 D). There were 373 (68%) eyes with a refraction of +/- 0.50 D, and 483 eyes (89%) within +/- 1.00 D of emmetropia. Ten eyes (2%) were overcorrected by more than 1.00 D. Mean baseline refractive cylinder was 1.01 +/- 0.75 D (range, 0-5.75 D); at 1 year, the mean cylinder was 0.40 +/- 0.55 D (range, 0-2.50 D). Uncorrected visual acuity was 20/20 or better in 297 (54%) eyes and 20/40 or better in 93%. Six eyes (1%) lost two to three lines of spectacle-corrected visual acuity; the worst visual acuity was 20/30. Of patients responding to a standardized questionnaire, 320 (77%) wore no spectacles for distance or near vision; there was a significant increase in glare and fluctuation of vision from baseline; and 247 (90%) were very satisfied with the outcome. CONCLUSIONS: Refractive keratotomy using radial incisions with or without transverse incisions and following the Casebeer system effectively reduces and often eliminates myopia and astigmatism with a high degree of safety. Enhancement surgery was required in 39% of eyes. Glare and fluctuation of vision increased postoperatively but were rated mild, and patient satisfaction was high.

Adult↗
PubMed1993

Phacoemulsification after T-hex keratotomy.

T-hex keratotomy surgically corrects manifest hyperopia. The typical patient presenting for this surgery is a presbyope who develops symptoms from latent hyperopia. These patients are older than typical radial keratotomy patients and are thus likely to develop senile cataracts sooner. The exact surgical approach to cataract surgery in such patients is unknown. We report a patient who had successful cataract extraction by phacoemulsification with implantation of a posterior chamber lens after a previous routine T-hex keratotomy. The preoperative workup and the surgical technique did not require modification.

Aged↗
PubMedDate not supplied

ALK education.

Explore the source record for details and available documents.

Cornea↗
PubMedDate not supplied

Sutureless homoplastic lamellar keratoplasty.

BACKGROUND: Previously, penetrating keratoplasty has been used to treat corneal cap complications related to keratomileusis. We sought to develop a technique to avoid the unnecessary use of penetrating procedures for lamellar problems, that would be technically easier than standard lamellar keratoplasty--sutureless homoplastic lamellar keratoplasty. METHODS: Five eyes with complications from automated lamellar keratoplasty underwent sutureless homoplastic lamellar keratoplasty utilizing an automated microkeratome and topical anesthesia. RESULTS: Three of the five eyes had improved vision; two eyes with final visual acuities of 20/20 and 20/30. The two remaining eyes had poor host stromal beds and required penetrating keratoplasty. The mean follow-up time was 13 months (range 3 to 36 months). All lamellar grafts were clear and well-seated at the last postoperative examination. CONCLUSION: Sutureless homoplastic lamellar keratoplasty is an alternative to penetrating keratoplasty in some eyes that have cap-related problems.

Cornea↗