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Biomedical subjects

S P Thornton

Publications and source records attributed to S P Thornton.

At least 19 recordsLinked to original sources
PubMed1991

Ophthalmic pre-inked marking pad.

Various markers that facilitate incision and suture placement are available. The majority are used in conjunction with a surgical marking pen or ink. This report describes a new, disposable pre-inked marking pad which is conveniently packaged, easy to use, and compatible with most markers. The pad is saturated with gentian violet ink which enables an ideal transfer of inked marks from the marker to the eye or skin. The ink marks remain on the tissue for two to four hours before fading, even on wet and moist surfaces such as the cornea and sclera.

Cataract Extraction↗
PubMed1990

Astigmatic keratotomy: a review of basic concepts with case reports.

Despite the use of small incisions, better wound closure, and other technical improvements in cataract and corneal surgery, astigmatism remains a problem for the cataract and refractive surgeon. Case reports illustrate the applicability of astigmatic keratotomy in post-cataract and idiopathic astigmatism. The basic concepts of corneal relaxing incisions are reviewed and the frequently misunderstood coupling phenomenon is explained in the light of the "law of elastic domes." Properly used, astigmatic keratotomy with coupling effectively corrects a wide variety of types of astigmatism.

Aged↗
PubMed1987

Graded nonintersecting transverse incisions for correction of idiopathic astigmatism.

We present the results of a consecutive series of graded transverse (T) incisions for correcting idiopathic astigmatism evaluated by vector analysis, a method not previously used to report T-incision results. In fact, no clinical studies on the results of the T-incision method have been reported. For comparison with conventional reporting methods, the results of graded T incisions on a series of eyes were evaluated, using both vector analysis and simplified analytic procedures. Sixty eyes were evaluated following surgery based on the Thornton guide for astigmatism correction. The mean preoperative cylinder in the series was 1.5 diopters (D) (SD = 0.43, range 1.00 D to 2.25 D); mean postoperative cylinder was 0.4 D (SD = 0.61, range 0 to 3.75 D). The mean decrease of 1.1 D was statistically significant. The results show that it is possible to quantify astigmatism correction using vector analysis.

Adult↗
PubMed1986

A guide to ultrasonic pachymeters.

An ongoing study of ultrasonic pachymeters has been carried out to determine the accuracy, reproducibility, and ease of operation of currently available ultrasonic pachymeters. Side-by-side evaluation was done to determine interobserver variation and a number of other factors. The results to date are summarized as a guide.

Cornea↗
PubMed1984

A guide to pachymeters.

An ongoing study of pachymeters has been carried out to determine the accuracy, reproducibility, and ease of operation of various optical and ultrasonic pachymeters. Beginning with optical versus available ultrasonic pachymeters, the demonstrated greater accuracy and reproducibility of ultrasound led to enlargement of the study to a comparison of all available ultrasonic pachymeters. Side-by-side evaluation was undertaken to determine interobserver variation and a number of other factors. The results are summarized as a guide.

Cornea↗
PubMed1977

Nasolacrimal duct reconstruction with the nasolacrimal duct prosthesis: an alternative to standard dacryocystorhinostomy.

For many years the standard surgical treatment for chronic dacryocystitis has been the edge-to-edge anastomosis of the lacrimal sac mucosa to nasal mucosa over the margins of a hole made through the lacrimal bone. Failures of this standard procedure have been attributed to many factors and complications frequently require reoperation. The procedure described in this paper was developed as a means of overcoming some of these difficulties. It provides a normal, gravity draining, nasolacrimal duct system without pooling and not requiring destruction of the lacrimal bone or alteration of normal anatomy. It consists of the implantation of a permanent indwelling nasolacrimal duct prosthesis (available from Concept, Inc., Clearwater, FL) from the base of the sac through the interosseous canal into the vault of the inferior nasal meatus. Because it does not involve bypassing the normal lacrimal drainage system, the technique is more simple and less traumatic. This method of reconstruction of the nasolacrimal duct has converted a major hour and a half procedure into a 15 minute operation. Because normal anatomic relationships are retained, the nasolacrimal duct prostheis gives reasonable assurance of permanent drainage and is recommended as a primary procedure of choice.

Dacryocystitis↗
PubMed1977

A rapid test for dark adaptation.

With the known relationship between defects in dark adaptation and vitamin A deficiency, liver disease, and retinal degenerative changes, the development of a practical and simple test of dark adaptation has taken on some importance. Standard dark adaptation testing instruments are somewhat impractical, expensive, and not generally available. Therefore a simple, in expensive test for evaluation of dark adaptation is desirable. Using established standards of macular dark adaptation, a test was designed that appears to be relatively simple, reasonably accurate, and rapid. The test and equipment are described.

Automobile Driver Examination↗