The present study reveals that pupillary abnormalities are common after keratoplasty for keratoconus and that, in addition to the fixed dilated pupils which we have found in 7.8 per cent. of eyes, varying degrees of partially dilated pupil frequently occur after operation. In our experience, glaucoma is not a sequel to the simple paretic pupil, a finding which confirms the results of the smalle...

The Pentacam’s new densitometry software is not without limitations. A poorly dilated pupil interferes with the device’s sampling technology, and so eyes with pseudoexfoliation, trauma, and intraoperative floppy iris syndrome, for example, are problematic. Also, white cataracts block the system’s ability to sample the central nucleus. Nevertheless, comparison studies with the LOCS III system ha...

We report the correction of aphakia using an iris-claw, aphakic intraocular lens (IOL) fixated in a retropupillary location in a 17-year-old young man who suffered blunt trauma to his eye 5 months after penetrating keratoplasty (PKP). There were no intraoperative complications. At 21 months after implantation, the patient's uncorrected distance visual acuity was 20/28; his corrected distance vi...

Beta-nerve growth factor (NGF) is a protein necessary for the survival and maintenance of sympathetic and sensory neurons that appears to be produced by the target tissues of these neurons in vivo. Both denervation and the culture of explants of one model target, the rat iris, leads to an increase in the NGF content, suggesting that innervating neurons may regulate a step in synthesis or turnov...

Iris-fixated IOLs, positioned either anterior or posterior to the iris plane, are an alternative to scleral-fixated posterior chamber IOLs or angle-fixated anterior chamber IOLs, with several advantages. Specifically, although scleral fixation of a posterior chamber IOL preserves the ocular anatomy, the surgical procedure is complex, with potentially severe complications, extended surgical time...

Local application of platelet-activating factor (PAF) on the rabbit eye caused a dose-dependent significant increase in intraocular pressure (IOP). After laser irradiation of the iris the IOP showed a hypertensive phase of about 3 hr. Prophylactic treatment with the PAF antagonist BN 52021 but not with indomethacin abolished the hypertensive phase. Elevated levels of protein (10.6 +/- 0.9 g/l) ...

Iris recognition is one of the most reliable methods for identification. In general, itconsists of image acquisition, iris segmentation, feature extraction and matching. Among them, iris segmentation has an important role on the performance of any iris recognition system. Eyes nonlinear movement, occlusion, and specular reflection are main challenges for any iris segmentation method. In thi...

Iris recognition is one of the most reliable methods for identification. In general, itconsists of image acquisition, iris segmentation, feature extraction and matching. Among them, iris segmentation has an important role on the performance of any iris recognition system. Eyes nonlinear movement, occlusion, and specular reflection are main challenges for any iris segmentation method. In thi...

H ere we present a potential novel surgical technique consisting of fixation of a posteriorchamber intraocular lens to the iris that may be used in the treatment of aphakia or the management of intraocular lens complications when capsular support has been compromised. The technique was performed in a laboratory model using cadaveric human eyes. A commercially available neurovascular clip was us...