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Biomedical subjects

W F Maloney

Publications and source records attributed to W F Maloney.

18 recordsLinked to original sources
PubMed1997

Supracapsular phacoemulsification: a capsule-free posterior chamber approach.

We describe a technique that relocates the phacoemulsification process outside the capsular bag by transposing the nucleus through an intact 5.0 to 6.0 mm capsulorhexis. The upside-down nucleus is then returned to the posterior chamber, positioned above the anterior capsule in the "supracapsular space" where it remains throughout the phacoemulsification procedure of choice: cracking, chopping, manual prechoping, or traditional sculpting. The chief advantage of supracapsular phacoemulsification is greater efficiency, which is manifested in reduced emulsification time and energy. Disadvantages include the possibility of mild postoperative corneal edema during the earliest part of the learning curve, as well as inadvertent damage to the iris in cases with suboptimal pupil dilation.

Humans↗
PubMed1993

Crack and flip phacoemulsification technique.

The crack and flip phacoemulsification technique combines the advantages of circumferential division of the nucleus and nucleofactis techniques. As such, it adds safety and control to the procedure. We describe each of the surgical maneuvers, including machine settings, and explain the rationale for maneuvers and machine settings.

Cataract Extraction↗
PubMed1992

Transverse astigmatic keratotomy. An integral part of small incision cataract surgery.

Transverse astigmatic keratotomy (TAK) is used with an astigmatically neutral wound to control against-the-rule astigmatism. Previously both wound manipulation and TAK have been used to alter astigmatism, but with the advent of astigmatically neutral small incision surgery, astigmatism control involves TAK alone. This paper discusses the TAK approach to astigmatism control and includes a nomogram for incision size.

Astigmatism↗
PubMed1991

Universal small incision for cataract surgery.

The goal of small incision cataract surgery is to perform the entire procedure, cataract removal and intraocular lens insertion, through the smallest incision possible. Ideally the incision would be 3.0 mm in length, but because of practical considerations, a slightly larger wound is typically used. We describe a universal trapezoidal wound that is astigmatically neutral and provides the benefits of the ideal 3.0 mm incision, but allows the use of any small incision lens requiring an incision of 5.2 mm or less.

Astigmatism↗
PubMed1990

Astigmatic keratotomy to correct preexisting astigmatism in cataract patients.

We evaluated three general strategies for dealing with astigmatism control following phacoemulsification with posterior chamber intraocular lens surgery: (1) a neutral wound closure to minimize surgically induced cylinder; (2) wound revision techniques to minimize residual postoperative cylinder; (3) astigmatic keratotomy incisions to treat preexisting astigmatism. With the neutral wound closure, mean postoperative keratometric cylinder averaged less than 1 diopter (D). In the presence of moderate preoperative astigmatism (1.0 D to 1.9 D), the wound revision technique tended to undercorrect, while the astigmatic keratotomy tended to overcorrect. However, the keratotomy procedure resulted in less postoperative cylinder. For cases with substantial preoperative astigmatism (greater than or equal to 2 D), the astigmatic keratotomy groups corrected more of the preoperative cylinder, which resulted in a greater proportion of cases with less than 1 D of postoperative cylinder and a smaller proportion with more than 2 D. Results suggest that astigmatic keratotomy is a useful adjunct to correct preexisting astigmatism in cataract patients. However, this procedure as any incisional refractive surgery technique has a certain amount of inherent biological variability.

Adult↗
PubMed1989

Astigmatism control for the cataract surgeon: a comprehensive review of surgically tailored astigmatism reduction (STAR).

It is increasingly possible for the cataract surgeon to control astigmatism. Based on a review of 4,000 consecutive patients, three categories of astigmatism and cataract patients are identified. A specific approach to astigmatism control for each category is discussed. Preliminary results on the use of astigmatic keratotomy in conjunction with cataract surgery are presented.

Aged↗
PubMed1988

Synthetic cataract teaching system for phacoemulsification.

This paper describes a surgical training system for teaching and practicing the necessary skills to perform phacoemulsification, endocapsular phacoemulsification, and small incision intraocular lens insertion techniques. The surgical system includes head, bilateral globes, removable corneas, and replaceable synthetic cataracts of varying density. This synthetic system simulates ocular surgery more closely than previously used animal eyes and allows the surgeon to practice new techniques in laboratory courses and in the operating facility.

Cataract Extraction↗
PubMed1980

Evaluation of the causes and accuracy of pharmacologic localization in Horner's syndrome.

Of 450 cases of Horner's syndrome examined by pupillography. 13% were caused by tumor but less than 3% were undetected malignant tumors. The largest group of lesions (40%) had an undetermined cause, presumably related to vascular disease. Although the hydroxyamphetamine test usually can differentiate postganglionic from preganglionic lesions, its clinical value and accuracy for this purpose has been overemphasized in previous reports. Of the 13 undetected malignant neoplasms, nine (69%) manifested as Pancoast's syndrome with arm pain, a reliable sign to identify patients with Horner's syndrome caused by undetected malignancy.

Adolescent↗
PubMed1979

Specular microscopy of traumatic posterior annular keratopathy.

Specular microscopic studies in two patients with traumatic posterior annular keratopathy demonstrated that the endothelial rings consist of disrupted and swollen endothelial cells. The damaged cells were still evident many days after the rings had disappeared. The amount of endothelial cell loss depends on the severity of the injury, and a measurable decrease in cell density occurs only in the more severely injured patients. A physical explanation for the occurrence of these endothelial rings is discussed.

Adolescent↗
PubMed1979

[Guidelines to productivity bargaining in the health care industry].

A potential conflict exists between the recent growth of unionization in the health care industry and management efforts to increase productivity. One method of managing this conflict is to link employee rewards to employee productivity through productivity bargaining.

Collective Bargaining↗
PubMed1977

Hereditary vitelliform macular degeneration: variable fundus findings within a single pedigree.

A pedigree of 141 persons with hereditary vitelliform macular degeneration was studied. Of the 80 patients examined, 20 were affected. Fundus photographs of selected lesions in this pedigree demonstrated the broad spectrum of phenotypic expression of this hereditary disorder. This entity has an extremely variable expression even among affected members of the same family.

Adolescent↗