Search PubMed⌕ Search

Biomedical subjects

J I Barraquer

Publications and source records attributed to J I Barraquer.

At least 19 recordsLinked to original sources
PubMed1995

[Corneal reinnervation after keratomileusis in situ and keratomileusis myopica--a comparison].

BACKGROUND: In a retrospective study corneal sensitivity after keratomileusis in situ and keratomileusis myopica was measured. METHOD: 5 points on the cornea were measured with the Draeger aesthesiometer at 18 eyes after keratomileusis myopica and at 66 eyes after keratomileusis in situ. RESULTS: The ingrowth of corneal nerve fibres is delayed after keratomileusis myopica compared to keratomileusis in situ because of delayed stromal repopulation of keratocytes and disturbances of stromal metabolism due to toxic effects of the cryopreservation solution.

Adolescent↗
PubMed1995

[Corneal reinnervation after lamellar refractive corneal surgery].

In a retrospective study corneal sensitivity after refractive autokeratoplasty for correction of myopia was measured. Thirty-eight patients operated on for keratomileusis in situ and 18 patients for keratomileusis myopica were examined with the Draeger esthesiometer between 1 and 23 months after surgery. Three measurements points were on the refractive disc, two others on the untouched cornea. After keratomileusis myopica, the corneal reinnervation is significantly delayed compared to keratomileusis in situ. In the first group sensitivity is normal after 2 years and in the second group after 1 year. Even refraction and visual acuity depend on metabolism and reorganization of the tissue after surgery. Besides retarded cell repopulation and disturbed stromal metabolism--caused by toxic and cryopreservation effects--the dissection depth of the refractive ablation is responsible for these phenomena.

Adolescent↗
PubMed1990

Histopathology of human keratorefractive lenticules.

Eight human corneal lenticules (three from keratophakia, two from hypermetropic keratomileusis, and three from myopic keratomileusis) were examined by light and electron microscopy. The keratophakic lenticules were removed for optical reasons 3, 3.5, and 6 months after surgery. Microscopically, all displayed hypocellularity, mature collagen fibrils and microfibrils, keratocyte ghosts, and keratocytic debris. The hypermetropic keratomileusis specimens were removed at 13 and 14 months postoperatively, the first because of opacities from enzymatic digestion of the cornea, and the second due to contact lens-induced erosion of Bowman's layer and decreased lacrimal secretion. Ultrastructurally, both lenticules exhibited fractures in Bowman's layer, and the 14-month specimen showed multilayered squamous epithelia. The myopic keratomileusis specimens were removed at 4, 8, and 48 months postoperatively due to opacification of the interface caused by delayed epithelial healing, detergent trauma, and previous epithelization, respectively. Electron microscopy revealed fractures in Bowman's layer, subepithelial fibrocellular growth, sparse keratocyte populations of the anterior stroma, porous collagen bundles, keratocytic debris, and regions of epithelial ingrowth.

Adult↗
PubMed1983

Results of hypermetropic keratomileusis, 1980-1981.

The series of cases discussed in this chapter consisted of 135 consecutive cases performed in 120 patients over a two-year period. The first group consisted of 10 cases of hypermetropia with a mean spherical equivalent of +7.75 diopters, a mean uncorrected acuity of 0.14 (20/150) and a mean best corrected acuity of 0.42 (20/50). The mean postoperative spherical equivalent was +1.00, the uncorrected acuity was 0.41 (20/50), and the best corrected acuity was 0.63 (20/30). A second group of 14 cases of monocular aphakia had mean preoperative spherical equivalents of +14.25 and best corrected acuity of 0.62 (20/30). Postoperatively the uncorrected acuity was approximately 0.19 (20/100-), the mean spherical equivalent was +2.85, and the best corrected acuity improved to 0.64 (20/30). The third and largest group consisted of 111 eyes that underwent simultaneous cataract extraction and hypermetropic keratomileusis. Since many of these patients had cataracts, the mean preoperative acuities and refractive errors cannot be adequately analyzed. In the 1980 group, which consisted of 67 cases, postoperatively the average acuity without correction was 0.21 (20/100+) with spherical equivalents of approximately +2.70 diopters. The acuity with the best correction was approximately 0.60 (20/30). In the second group of 40 cases, operated on in 1981, that underwent simultaneous cataract extraction and hypermetropic keratomileusis with a follow-up time half that of the 1980 group, the results were approximately the same.

Adult↗
PubMed1981

Keratophakia and keratomileusis--clinical results.

A random, retrospective study was performed on 158 patients. who underwent keratophakia and keratomileusis for the correction of refractive errors. The primary indication for surgery was high anisometropia. Data on corneal curvature modification, refraction, accuracy, stability, and complications are reported. Both keratophakia and hypermetropic keratomileusis are capable of fully correcting aphakic hyperopia. Myopic keratomileusis corrected up to 16 diopters of myopia in this series. Lamellar refractive keratoplasty appears to have no significant detrimental effect on visual acuity. The majority of myopic patients had an improved best-corrected visual acuity postoperatively. High or irregular astigmatism was not noted following this surgery. The stability of the postoperative curvature appeared to be good with both keratophakia and myopic keratomileusis. Complications in this series were minimal, and one resulted in decreased vision postoperatively. Inaccuracy in achieving the desired refractive result appeared to be the major disadvantage of these techniques.

Adolescent↗
PubMed1974

[Keratophakia].

Explore the source record for details and available documents.

Aged↗
PubMed1972

Keratophakia.

Explore the source record for details and available documents.

Cornea↗