Biomedical subjects

J I Barraquer

Publications and source records attributed to J I Barraquer.

At least 19 recordsLinked to original sources

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↗

PubMed1983

[Keratomileusis and keratophakia for the correction of congenital hypermetropia and aphakia].

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Adolescent↗

PubMed1981

Keratomileusis for myopia and aphakia.

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Aphakia↗

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↗

PubMed1977

[A new syndrome: lachrymal hyposecretion, ocular hypotony, hypo-convergence (author's transl)].

A new syndrome is described, observed in patients with lachrymal hyposecretion without rheumatoid manifestations. It consists in the association of ocular hypotony, decrease of convergence, and in some cases vitreous retraction, to lachrymal hyposecretion. There is a predominance of this syndrome in females.

Accommodation, Ocular↗

PubMed1974