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Biomedical subjects

B L Halpern

Publications and source records attributed to B L Halpern.

12 recordsLinked to original sources
PubMed1999

Refractive error consequences of reversed-optic AMO SI-40NB intraocular lens.

OBJECTIVE: To evaluate the refractive consequences of inadvertently implanting a reversed-optic AMO SI-40NB posterior chamber intraocular lens (IOL). DESIGN: Retrospective case series. METHODS: One surgeon (BLH) implanted 457 SI-40NB IOLs over a 2-year period beginning on January 1, 1996, and ending on December 31, 1997. Six of these IOLs (1.3%) were noted to have been implanted with a reversed optic. The authors retrospectively reviewed the target spherical equivalent refractive errors (SEREs) and actual postoperative SEREs for all 457 eyes. MAIN OUTCOME MEASURES: The SRK-II formula was used to predict target SEREs. Actual postoperative SEREs were determined at 1 month after surgery using either a manifest or an automated refraction. Target postoperative SEREs were subtracted from actual postoperative SEREs to calculate diopter surprises, or the degree to which the actual SEREs differed from the target SEREs. RESULTS: The mean (+/-standard deviation) diopter surprise for reversed-optic SI-40NB IOLs was 0.01 (+/-0.89) diopter (D) more myopic than predicted; diopter surprises ranged from -1.39 D to +1.42 D. The mean diopter surprise for nonreversed SI-40NB IOLs was 0.18 (+/-0.81) D more hyperopic than predicted; diopter surprises ranged from -1.88 D to +2.56 D. The difference between the mean diopter surprises (0.19 D) was not statistically significant (t = 0.56, P = 0.57). CONCLUSIONS: A reversed-optic SI-40NB IOL is as likely to produce a satisfactory refractive result as a nonreversed IOL. Therefore, the refractive consequences of a reversed-optic SI-40NB IOL do not warrant the risks associated with repositioning the lens.

Aged↗
PubMed1995

The incidence of atonic pupil following cataract surgery.

OBJECTIVE: To determine and compare the incidence of atonic pupil following modern extracapsular cataract extraction and small-incision phacoemulsification with lens implantation in a large series of consecutive patients. PATIENTS AND DESIGN: A retrospective review was undertaken of 1283 consecutive cases of cataract surgery with posterior chamber intraocular lens implantation (919 extracapsular and 364 small-incision phacoemulsification) performed by two surgeons between October 30, 1991, and June 30, 1993. Postoperative atonic pupil was defined as a pupil that, following cataract surgery, was 6 mm or more in diameter and minimally or nonreactive to light, accommodation, or 1% pilocarpine hydrochloride. RESULTS: Postoperatively, 25 (1.95%) of 1283 eyes developed an atonic pupil following cataract extraction with posterior chamber intraocular lens implantation (21 [2.29%] of 919 extracapsular and four [1.10%] of 364 phacoemulsification procedures). When an atonic pupil was present following surgery, disturbing glare often resulted, despite a well-centered intraocular lens. CONCLUSIONS: To our knowledge, this is the first large, consecutive study of the incidence of atonic pupil following modern cataract surgery and the first study to compare the incidence of atonic pupil following extracapsular surgery vs small-incision phacoemulsification. Although the incidence of atonic pupil may be lower following phacoemulsification, caution is advised in the implantation of ever-smaller optic lenses.

Adult↗
PubMed1979

Transient open-angle glaucoma associated with sickle cell trait: report of 4 cases.

Four black patients, all with sickle trait (SA), developed transient open-angle glaucoma with blood in Schlemm's canal. In 3 patients the condition followed blunt trauma, while in the fourth no antecedent trauma was described. The intraocular pressure became normal in all 4 cases with the resolution of the haemorrhage from the trabecular meshwork and Schlemm's canal.

Adult↗
PubMedDate not supplied

Corneal topographic changes induced by pterygia.

BACKGROUND: This study characterizes the topographic changes induced by pterygia. METHODS: Using data obtained from a videokeratoscope (TMS-1), we assessed the topographic changes of corneas from 24 consecutive eyes with pterygia. RESULTS: Each pterygium induced a localized area of flattening central to its apex of 38.00 +/- 2.80 diopter (D) which was significantly flatter (p < .0001) than the mean corneal power (43.70 +/- 1.70), minimum corneal power (MinK, 42.70 +/- 2.10), and the power of the flattest corneal meridian (42.90 +/- 1.90). CONCLUSIONS: Our topographic findings characterize an area of localized corneal flattening central to the apex of pterygia. It is not known if this pterygium-associated corneal flattening influences the centripetal growth of pterygia or their tendency not to cross the visual axis.

Cornea↗