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Biomedical subjects

R C Troutman

Publications and source records attributed to R C Troutman.

12 recordsLinked to original sources
PubMed1979

Keratophakia: a preliminary evaluation.

The results of 18 cases of combined cataract extraction and keratophakia are presented. Initial results indicate that these procedures may replace the use of alloplastic materials for the correction of aphakic ametropia either as a primary or a secondary procedure.

Aged↗
PubMed1979

Astigmatic considerations in corneal graft.

Some fictions about astigmatism should be dispelled: 1) Sutures determine astigmatism. They do not. 2) The size of the graft is contributory to astigmatism. It is not contributory. 3) Anterior or posterior cutting of the graft makes no difference. It does make a difference. 4) Same size trephine can be used to cut graft and recipient opening. Not when graft is cut from posterior surface or significant flattening will result. 5) A small cutting error is of no consequence. A small cutting error can cause a great deal of astigmatism. Tissue factors are paramount. Sutures must maintain wound apposition primarily. Posterior cutting requires a larger diameter trephine. A one-half-mm cutting error can cause an astigmatism of five diopters. Excessive corneal astigmatism, when it does occur, can be controlled by corneal wedge resection. The surgical keratometer identifies and limits surgical and suture-induced errors. Success in microsurgical keratoplasty can no longer be defined only as a clear graft. It must include also minimal or no residual optical error.

Astigmatism↗
PubMed1978

Repair of corneal wounds and the elimination of astigmatism.

The modern management of corneal incisions and lacerations, in addition to their accurate repair, necessarily includes the prevention or subsequent correction of induced astigmatism and axial errors. This is yet another important aspect of the new and burgeoning field of refractive corneal microsurgery.

Astigmatism↗
PubMed1978

Refractive keratoplasty: keratophakia and keratomileusis.

We have presented our early experience with the refractive keratoplasty techniques of Doctor Jose Barraquer--keratophakia and hypermetropic keratomileusis. In contradistinction to the alloplastic lens substitutes currently being employed for the integral correction of aphakia, his techniques would seem to offer a more permanent, more physiologic, full-time optical correction of the aphakic state. Their use is limited only by the condition of the patient's corneaa and, in fact, may be applied not only in aphakia but also in phakic eyes with higher degrees of hyperopia or myopia. In the opinion of the authors, the refractive keratoplasty techniques of Barraquer can be perfored by any well-instructed ophthalmic surgeon. These techniques offer to many patients a satisfactory and potentially a physiologically superior alternative to alloplastic lens substitute for aphakic correction.

Aged↗
PubMed1976

Placement of sutures used in corneal incisions.

In monkey eyes, 10-0 monofilament nylon suture for corneal wound closure was placed deep to the level of Descemet's membrane or through corneal tissue. The material produced a minimal inflammatory reaction and held the corneal wound in good anatomical position, effecting closure in depth.

Animals↗
PubMed1975

Recurrent granular corneal dystrophy.

Four full-thickness corneal buttons and tissue from one lamellar keratoplasty, derived from four patients with granular corneal dystrophy recurring in previously transplanted corneas, were studied by light and transmission electron microscopy. Fibrous tissue without vascularization was present between the epithelium and Bowman's membrane and contained deposits characteristic of granular dystrophy in both light and electron microscopy. The recurrence of dystrophy in the normal donor cornea is the result of infiltration of the grafted cornea by host invasion. The donor stroma is spared.

Adolescent↗
PubMed1975

Comparison of tissue reaction to nylon and prolene sutures in rabbit iris and cornea.

The tissue reaction in rabbit iris and cornea to prolene suture is equivalent to the tissue reaction to nylon suture. The prolene suture retains its tensile strength indefinitely and this may make it particularly useful in situations where a permanent suture is desired, such as in refractive keratoplasty, scleral buckle, or to suture an intraocular lens to the iris. The prolene suture also has a greater elasticity and this property may be advantageous in some clinical applications. We feel that a clinical study on humans is now warranted and we have started such a study.

Animals↗
PubMedDate not supplied

The use and preliminary results of the Troutman surgical keratometer in cataract and corneal surgery.

The Troutman microsurgical keratometer has been shown to be useful in monitoring intraoperative procedures, and it has been demonstrated in the case of cataract and keratoplasty to have a significant influence on the control of operatively induced astigmatism. It is applicable to any surgical procedure which has the potential of altering permanently and unpredictably the corneal curvatures. Intraoperative keratometry has clearly demonstrated some inadequacies of our current cataract and keratoplasty techniques. It is now being used to guide our efforts toward a more rational control of the vexing problem of astigmatism.

Astigmatism↗