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Biomedical subjects

J R Karickhoff

Publications and source records attributed to J R Karickhoff.

11 recordsLinked to original sources
PubMed1992

Pigmentary dispersion syndrome and pigmentary glaucoma: a new mechanism concept, a new treatment, and a new technique.

Reverse pupillary block is introduced as a new cataract-implant complication and as the principle mechanism in pigmentary dispersion syndrome (PDS) and pigmentary glaucoma (PG), causing posterior iris bowing and zonular rubbing. This mechanism was investigated by performing laser iridotomy on six patients. Following surgery, the iris moved forward completely and permanently to the planar position. A new technique, locating the iridotomy by transillumination, reduced the laser energy needed for iridotomy. Laser iridotomy located with transillumination is recommended as the treatment for iris-zonular rubbing in PDS and PG caused by reverse pupillary block.

Adult↗
PubMed1991

Adding automated perimetry to glaucoma evaluation and treatment.

Tangent-screen visual fields were compared with the fields determined by a newly acquired automated perimeter in 100 eyes of consecutive patients with glaucoma or suspected glaucoma. The tangent screen found defects in 12 eyes, and the automated perimeter found defects in 34 eyes. Because the automated perimeter found new defects or defects much worse than were found by the tangent-screen examinations, three patients received timolol, and a laser iridotomy, two laser trabeculoplasties, and three filtering operations were done on other patients. The major benefit in switching from tangent screen to automated perimetry was increased confidence in the visual fields tested as an indicator for treating patients with glaucoma. A minor problem in using the automated perimeter was that the testing was slightly longer and more tiring. This problem was reduced by using a translucent occluder, rather than the universally used opaque one.

Glaucoma↗
PubMed1987

Plus meridian incision for secondary implantation.

We studied 25 consecutive secondary implantations with a minimum of 4 months follow-up to learn the effect on astigmatism of passing or not passing the incision through the most plus corneal meridian. Eighteen of the 19 cases having a most plus meridian incision had postoperative astigmatism of 1 diopter or less, and their average astigmatism was reduced by surgery. All six of the cases with the incision not passed through the most plus meridian had postoperative astigmatism greater than 1 diopter, and their average astigmatism was doubled by surgery. The astigmatic difference between the two patient groups was highly significant. A most plus meridian incision is recommended.

Humans↗
PubMed1980

Instruments and techniques for anterior chamber implants.

The widely used white-to-white + 1 method was investigated clinically for its accuracy in choosing implant length. This method allowed the surgeon to open one implant per case in approximately 65% of cases. The basic concept of adding 1 mm to the clear corneal diameter was then investigated with cadaver eyes. The concept was found to be quite inaccurate. An anterior chamber ruler is described that allows the surgeon to open one implant per case in 95% of cases. An implant ruler for checking the length of the implant and the plane of the feet also is described. An implant positioner is described that inserts the distal feet, inserts the proximal feet, checks the implant fit, and changes the axis if necessary.

Anterior Chamber↗
PubMed1979

Director for the Choyce implant.

I designed an instrument for directing the inferior and superior feet of the Choyce intraocular implant into the anterior chamber angle.

Humans↗