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Biomedical subjects

A C Neumann

Publications and source records attributed to A C Neumann.

24 records · Page 2Linked to original sources
PubMed1984

Radial keratotomy: a comprehensive evaluation.

A prospective clinical investigation of radial keratotomy employing the Fyodorov method and instrumentation was initiated in March, 1980. The results of the first 147 eyes undergoing this surgical procedure for the reduction or elimination of myopia were analyzed one year following surgery. The mean preoperative, uncorrected visual acuity was finger counting vision and the mean preoperative myopic spherical equivalent was 5.33 diopters. The preoperative myopic refractive error ranged from 1.75 to 11.75 diopters. Radial keratotomy resulted in a mean uncorrected visual acuity of 20/35 with a mean reduction on myopia of 4.66 diopters. Eighty percent of the 147 eyes experienced 20/40 or better uncorrected vision. Sixty-eight percent of high myopia eyes (6.00 to 11.75 D) attained this level of uncorrected vision with a mean reduction of myopia of 6.23 diopters. Glare and variation of vision were the most frequently reported complications. A non-progressive endothelial cell loss of 5.2 percent was observed. The degree of preexisting myopia, patient age, fellow eye experience and surgeon learning curve significantly influenced the surgical result and facilitated the predictability of the procedure. Incision depth was directly related to surgical result. The low myopia group achieved stabilization of effect by six months while stabilization occurred later in patients with high degrees of initial myopia. Patient satisfaction was high and 78 per cent of the patients elected to undergo radial keratotomy in their fellow eye.

Adolescent↗
PubMed1984

Anterior megalophthalmos and intraocular lens implantation.

The problems associated with intraocular lens (IOL) implantation in two patients with megalophthalmic eyes are discussed. One patient initially received a posterior chamber IOL that proved to be too small for the internal diameter of the ciliary sulcus. It was removed and replaced with an iris-supported lens. The second patient received an iris-supported IOL that appears to be a satisfactory pseudophakic alternative for anterior megalophthalmic eyes.

Cataract Extraction↗
PubMed1970

Forum.

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Adult↗
PubMedDate not supplied

Radial thermokeratoplasty for the correction of hyperopia.

Hyperopic thermokeratoplasty involves making controlled thermal burns in the corneal stroma in a radial pattern up to a premarked clear zone. It steepens the central cornea and reduces the hyperopia. A series of 117 radial thermokeratoplasty eyes done in the Soviet Union were analyzed. Mean preoperative hyperopia of +5.27 diopters (range = +0.50 to +17.00 D) was reduced at 12 months after surgery by a mean of -3.48 D, resulting in a mean postoperative spherical equivalent of +1.84 D. Average correction was 70.8%. Forty percent of eyes were corrected to less than 1.00 D residual refractive error; however, 58% were undercorrected by 1.00 D or more. The proportion of eyes seeing 20/40 or better unaided increased from 10% preoperatively to 52% by 3 months after surgery and remained at 53% at 12 months after surgery. Overall refractive stability was demonstrated during the 1st postoperative year. Stepwise regression showed that none of the preoperative or surgical factors significantly predicted outcome when all eyes were evaluated.

Adolescent↗
PubMedDate not supplied

Delayed regression of effect in myopic epikeratophakia vs myopic keratomileusis for high myopia.

We compared the effectiveness and stability of our first six consecutive myopic epikeratophakia procedures (mean follow-up 18 months, range 14 to 26) with our first four consecutive cryolathe myopic keratomileusis procedures (mean follow-up 28 months, range 14 to 35). Myopic keratomileusis reduced preoperative myopia (range -8.9 to -12.1 diopters) by 77% to 94% in four patients. Refraction and visual acuity remained stable for over 1 to 3 years. In contrast, only three of the six myopic epikeratophakia procedures had stable results. The remaining three eyes which were within 0.38 D of emmetropia at the time of suture removal showed a loss of effect, resulting in myopia worse than their preoperative values in two eyes and a small correction in one eye. Only one of the six eyes achieved an uncorrected visual acuity better than 20/200. We conclude that myopic keratomileusis may be the procedure of choice for treating individuals with myopia of -8 to -15 D, because the incidence of late regression of effect after myopic epikeratophakia using the techniques in this study is unacceptable.

Adult↗