11 results match your criteria: "Univ.-Augenklinik Giessen.[Affiliation]"

Unlabelled: Besides the diffractive multifocals, which produce a second focus for near vision by means of diffraction rings, there are different refractive multifocal IOL types with 2-7 refractive zones or an aspheric/spherical construction principle. Long-term results: 2 years after implantation of diffractive multifocal IOLs, the corrected distance and near acuities were unchanged compared to the 3-month results. The uncorrected distance acuity was, however, slightly decreased due to a minus shift of refraction to -1.

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Two non-contact tonometers (Keeler "Pulsair" and Reichert NCT II) were compared regarding the reproducibility of their readings mutually and with referring literature about Goldmann applanation tonometry. Differences of maximum 2 mmHg were found using Pulsair tonometer/NCT II in 61%/83% for two subsequent readings, in 73%/89% for subsequent mean values of 3, in 86%/95% for subsequent mean values of 6 and in 97% each for subsequent mean values of 9 readings. The confidence intervals of 90% were +/- 5.

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In this study the Reichert non-contact tonometer (NCT II) was compared with the Goldmann applanation tonometer (GAT) in 25 subjects (50 eyes; pressure range 9-17 mmHg). The relationship NCT/GAT fulfilled the conditions required for legal verification. Marked differences between the readings of both instruments can be caused by anomalous central corneal thickness, because non-contact tonometry is influenced more than conventional applanation tonometry by the corneal thickness.

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The AO II non-contact tonometer (NCT) was compared with the Goldmann applanation tonometer (GAT) in 50 patients preoperatively and on the first day after cataract surgery. After pooling the preoperative and postoperative values, the relationship between NCT (y axis) and GAT (x axis) was described by the following regression: y = 1.01x - 0.

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Prior to, directly after and 15 minutes after preoperative Vörösmarthy oculopression (30, 40, or 50 mm Hg; 15 min), 30 patients were examined by oculooscillodynamography after Ulrich. Systolic retinal and ciliary perfusion pressures were higher directly after oculopression, whereas the systolic and diastolic ocular blood pressures (intramural pressures) were lower. These changes did not depend significantly on the level of oculopression.

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To detect cystoid macular edema after extracapsular cataract extraction, the authors used indirect ophthalmoscopy after oral application of fluorescein, rather than intravenous fluorescein angiography. The patients drank 10-20 ml 10% fluorescein sodium in 250 ml orange juice. Ophthalmoscopy was performed 30-45 minutes later using an exciter filter.

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A new hand-held tonometer, the Tono-Pen (TP), was compared with a Statham membrane manometer (MAN). The TP is a pen-sized Mackay-Marg tonometer with electronic signal analysis and digital pressure display. Comparative measurements of intra-ocular pressure (IOP) were performed on six cadavers (12 eyes in situ), 3-6 hours after death.

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In contrast to Vörösmarthy oculopression (VOP), suction-cup oculopression (SOP) is "pure" oculopression without compression of orbital tissue. Prior to 44 cataract operations with posterior chamber lens implantation, the authors performed SOP (negative pressure - 110 mm Hg) or VOP (level of oculopression 30 mm Hg) of the same duration (average 26 min). Before oculopression, a retrobulbar injection (RBI) was performed for local anesthesia.

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A new hand-held tonometer, Tono-Pen (TP), was compared with the Goldmann tonometer (GM). The TP utilizes the operating principle of the Mackay-Marg tonometer. However, the TP is battery-operated, only 18 cm long, weighs only 60 g, and features electronic signal analysis (single-chip microprocessor) and a digital pressure display (mm Hg).

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Injection of 5 ml anesthetic solution into the retrobulbar space causes the eye to protrude and the intraorbital pressure to increase up to 14 Torr. Subsequent pressure on the eye leads to enophthalmos and causes the elevated retrobulbar pressure to drop. This pressure never exceeds the perfusion pressure within the retinal vessels.

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The refraction of 50 eyes of nonsedated dogs was measured by retinoscopy. The slightly hyperopic to middle-grade myopic refraction found in earlier studies was seen in individual cases; however the mean value of 0.5 D is close to emmetropy.

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