Search PubMed⌕ Search

Biomedical subjects

J C Casebeer

Publications and source records attributed to J C Casebeer.

23 records · Page 2Linked to original sources
PubMedDate not supplied

Removal of corneal epithelium with phototherapeutic technique during multizone, multipass photorefractive keratectomy.

BACKGROUND: The therapeutic mode of the VISX 20/20 excimer laser was used to remove the corneal epithelium prior to performing photorefractive keratectomy (PRK) with a multizone, multipass technique. METHODS: A retrospective analysis was performed of 120 eyes of 90 patients that were treated for preoperative spherical refractive errors from -1.00 to -7.00 diopters (D) (mean -3.90 D, SD 1.54) by one surgeon (DGJ) over 7 months. RESULTS: Six-month follow-up was obtained in 76 eyes (63%). Sixty-nine eyes (91%) achieved a spherical equivalent refraction within +/-1.00 D of emmetropia. Regression of effect averaged -0.35 D (SD 0.53 D) from 1 to 6 months after surgery. Mean postoperative uncorrected visual acuity at 6 months was 20/25 (range 20/15 to 20/200). Seventy-three eyes (96%) achieved uncorrected visual acuity of 20/40 or better, 67 (88%) achieved uncorrected visual acuity of 20/25 or better, and 76 (71%) achieved 20/20 or better. Three eyes (4%) lost one line of spectacle-corrected visual acuity; no eye lost more than one line. There were no significant surgical complications. CONCLUSION: Removal of corneal epithelium with the Summit Excimed UV 200 LA excimer laser using multizone, multipass photoablation yields visual and refractive results that compare favorably with published PRK series with excellent short-term stability.

Adolescent↗
PubMedDate not supplied

Severe ocular trauma without corneal rupture after radial keratotomy: case reports.

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.

Accidents, Aviation↗
PubMedDate not supplied

Intraoperative pachometry during automated lamellar keratoplasty: a preliminary report.

BACKGROUND: The hinge technique greatly improves the results of automated lamellar keratoplasty but makes it impossible to measure the thickness of the corneal cap with a micrometer. We developed a technique of measuring cap and stromal disc thickness with a pachometer and compared the results with those obtained with a micrometer. METHODS: Measurements of the thickness of the stromal disc and/or corneal cap were taken with the Mitutoyo micrometer and the Chiron Corneo-Gage System III pachometer in five myopic and three hyperopic cases undergoing automated lamellar keratoplasty with complete cap resection. The intended postoperative refraction was plano. Postoperative refractions were taken at two months. RESULTS: In most cases, the corneal cap measured thinner while the stromal disc measured thicker by the micrometer than by the pachometer because of the hydration status of the stromal bed. In both myopic and hyperopic cases, the thickness measurements taken with the pachometer correlated better with the postoperative spherical equivalent values than those taken with the micrometer. CONCLUSIONS: The thickness measurement of corneal resections by both micrometry and pachometry is greatly influenced by tissue hydration status. When hydration is similar, the pachometer provides more accurate thickness readings than does the micrometer, as determined by correlations with intended refractive results.

Anthropometry↗
PubMedDate not supplied

Radial keratotomy in intact epikeratoplasty graft.

BACKGROUND: Epikeratoplasty can be used to flatten the cornea in keratoconus but is not a satisfactory tool to correct refractive errors in this setting. Radial and astigmatic keratotomy are unpredictable in keratoconus but can be used in an eye which has previously undergone epikeratoplasty for keratoconus. METHODS: We report a case of a pseudophakic eye with Keratoconus which received epikeratoplasty and subsequently underwent radial and astigmatic keratotomy in the graft. RESULTS: Before the refractive keratotomy, the patient had a refraction of -8.00 + 3.25 x 25. At 5 months after radial and astigmatic keratotomy, the patient had an uncorrected visual acuity of 20/60+ with a refraction of -0.50 + 2.00 x 28. CONCLUSIONS: This case demonstrates how different types of refractive corneal surgery can be combined to improve visual acuity in an individual patient. Whether the specific combination of epikeratoplasty and refractive keratotomy can be advocated in the treatment of keratoconus requires more experience with a greater number of patients.

Corneal Transplantation↗