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Biomedical subjects

J C Hagan

Publications and source records attributed to J C Hagan.

At least 55 records · Page 3Linked to original sources
PubMed1987

Modification of an irrigation/aspiration handpiece to provide visual and tactile orientation of the aspiration port.

To perform extracapsular cataract extraction safely the surgeon must know the orientation of the aspiration port of the irrigation/aspiration handpiece at all times. I have modified a commercially available irrigation/aspiration handpiece to allow visual and tactile orientation of the aspiration port even when it is obscured by iris, blood, or cortex.

Cataract Extraction↗
PubMed1987

A clinical review of the IOLAB Azar model 91Z flexible anterior chamber intraocular lens.

The IOLAB AZAR 91Z flexible anterior chamber intraocular lens may have the highest complication rate of any contemporary intraocular implant. Over 40,000 of these implants were inserted in human eyes. The complications of this lens includes a much higher than normal rate of chronic inflammation, cystoid macular edema, glaucoma, hyphema, vitreous hemorrhage, and pseudophakic bullous keratopathy. These complications together constitute the multiple manifestations of the UGH Plus syndrome. These complications tend to increase with time. The failure of the 91Z can be ascribed to problems of design and manufacturing causing excess movement, vaulting, and irritation of ocular tissue. Patients with this implant need to be notified of the high complication rate and the need for frequent follow-up. Most 91Z complications are recurrent or persistent and respond best to removal of the implant. Removal of the 91Z requires special technique to avoid traumatizing the eye. The design, materials, testing, manufacture, and recall of the 91Z needs close study to prevent another such problem prone lens from reaching widespread use.

Equipment Safety↗
PubMed1986

Additional long-term follow-up on the IOLAB Azar 91Z anterior chamber intraocular lens.

A retrospective study of 98 91Z anterior chamber intraocular lenses used with intracapsular cataract extraction was performed. Minimum follow-up was 12 months and average follow-up was two years seven months. These patients were part of a group of 113 91Z patients previously reported with minimum six-months follow-up and an average of one year follow-up. Comparing the two groups showed the number of patients with 20/40 visual acuity declined from 84.1% to 67.4% and those with visual acuity less than 20/400 increased from 0.9% to 5.1%. The number of 91Zs explanted more than doubled from five (4.4%) to 11 (11.2%). Pseudophakic bullous keratopathy not present in the one-year follow-up group is occurring with longer follow-up. This study demonstrates an increasing incidence of inflammatory - hemorrhagic and corneal complications in 91Z patients.

Aged↗
PubMed1985

Primary angle closure glaucoma in a myopic kinship.

Three related myopic individuals with primary angle closure glaucoma are reported. They had true myopia and not pseudomyopia secondary to increased lenticular index of refraction. We believe one of these individuals (-8.62 spherical equivalent) to have the most myopic case of primary angle closure glaucoma reported in the literature. Although myopia is associated with anatomical factors that offer considerable protection from primary angle closure glaucoma, its presence does not eliminate the possibility of this disease. Laser iridectomy was effective in the treatment of these patients.

Adult↗