Acute elevations of intraocular pressure following Nd:YAG laser posterior capsulotomy.
ABSTRACT We performed applanation tonometry preoperatively, hourly for the first four postoperative hours and on the first postoperative day in 66 eyes after Nd:YAG laser posterior capsulotomy in order to determine the nature of the acute intraocular pressure (IOP) elevation and the risk factors involved. Forty-one percent of eyes developed an intraocular pressure greater than 30 mmHg and 14% greater than 40 mmHg. The IOP spike occurred on the second postoperative hour in 35% of eyes. Patients with controlled glaucoma prior to capsulotomy had a significantly lower mean IOP rise than patients without glaucoma. Eyes with posterior chamber IOLs were less likely to develop an IOP greater than 30 mmHg than were aphakic eyes without IOLs. There was no correlation between the laser energy or the size of the capsulotomy and the IOP rise.
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ABSTRACT: In a patient with uveitis who had been treated with Nd:YAG laser capsulotomy after cataract surgery, several episodes of acute hypotonia occurred which were associated with changes in clinical tests of the eye and of visual function. Immunosuppressive and immunomodulating treatment appeared to reverse the changes in intraocular pressure and normalise the test results. The significance of these observations is discussed.Vision Research 11/1997; 37(20):2937-42. DOI:10.1016/S0042-6989(97)00085-0 · 2.38 Impact Factor
- Canadian Journal of Ophthalmology 05/2003; 38(3):230-2. DOI:10.1016/S0008-4182(03)80067-4 · 1.30 Impact Factor
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ABSTRACT: To define one possible etiology for the rise in intraocular pressure (IOP) after neodymium: YAG (Nd:YAG) laser capsulotomy and provide information for the continued investigation of this process. Laser Center, Eye and Ear Institute, Pittsburgh, Pennsylvania. Samples of 1% sodium hyaluronate or balanced salt solution (BSS) (control) were placed in a closed system and exposed to varying amounts of Nd:YAG energy delivered by a Coherent YAG laser. This system was hydrostatically coupled to a pressure monitor, and changes in pressure were recorded as a function of time. Average pressure increase was 0.140 mm Hg/mJ of YAG energy in the sodium hyaluronate samples and 0.017 mm Hg/mJ in BSS (P < .01). The relationship between total energy delivered and maximum pressure recorded for both substances was nearly linear. Further analysis of treated sodium hyaluronate samples showed that Nd:YAG energy can produce structural alterations. Neodymium:YAG laser energy has a pronounced effect on sodium hyaluronate that exceeds the thermal effect seen with BSS when the pressure is monitored in a closed system. These structural changes might contribute to the IOP rise seen clinically.Journal of Cataract and Refractive Surgery 07/1996; 22(6):748-51. DOI:10.1016/S0886-3350(96)80315-4 · 2.55 Impact Factor