Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P50583 (asymmetrical)
 12,197 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Since eye pairs are anatomically and pathologically asymmetrical, we attempted to determine whether the transition from ocular hypertension to glaucoma might be typified by lateral differences in either intraocular pressure (IOP), papillary excavation, or visual field. Such lateral differences were sought in a retrospective study of the medical records of 47 patients exhibiting ocular hypertension, of whom 25 remained hypertensives and 22 developed glaucoma during the period considered. Although all visual field indices in the latter group had remained within the normal range, the same side consistently yielded significantly worse results in mean sensitivity, and the absolute value for the lateral difference in these individuals was significantly higher than that found for the patients who did not develop glaucoma. Future glaucoma is manifested when the mean sensitivity remains worse in one eye.
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PMID:Lateral differences indicate future glaucoma. 154 64

Seventy-four per cent of 428 patients referred to the glaucoma clinic at Concord Hospital exhibited intraocular pressure (IOP) asymmetry. There was a preponderance of left eyes, in that two-thirds of the patients with asymmetrical pressures had the higher IOP in the left eye. As the degree of asymmetry increased, this trend became more pronounced. In addition, the statistically significant difference between right and left mean IOP among the glaucoma patients was not found among normal controls, even when the order of testing the eyes was reversed.
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PMID:Increased numbers of higher left intraocular pressures in 428 patients referred to the glaucoma clinic. 159 64

Outcome, prognosis and course of pigmentary glaucoma were studied in 38 patients (75 eyes). The mean age of the subjects at the time of diagnosis was 34.0 years and at the time of the study 44.1 years. The follow-up time ranged from 2 to 30 years with a mean follow-up time of 10.1 years. At the time of the study eighty-nine percent of the eyes had normal vision (0.7 or better), 3% slight impairment of vision (0.6-0.3), 5% low vision (0.2-0.05) and 3% were blind. Visual field defects were mild in 78%, moderate in 13% and severe in 8% of the eyes. One eye (1%) had normal fields. In 8 patients the stage of the field defects was asymmetrical between the two eyes. All were able to read at least monocularly with glasses. No one was blind, retired early or professionally limited because of pigmentary glaucoma. Thirty-nine eyes were on topical treatment. Fifteen eyes had additionally been treated with laser trabeculoplasty when the glaucoma could not be stabilized with topical treatment combined with systemic acetazolamide. Further twenty eyes had undergone trabeculectomy, 18 of them when medical treatment had failed and 2 following LTP. The non-involved eye of a patient suffering from a monocular disease was without treatment. The mean intraocular pressure at the time of the diagnosis was 33.5 mmHg (SD 10.4 mmHg) and at the final visit 17.5 mmHg (SD 3.4 mmHg). Four eyes were operated for cataracts and one for retinal detachment.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Long-term prognosis of pigmentary glaucoma. 175 Mar 11

Six unilateral cases and one bilateral case of dilated episcleral veins with elevated intraocular pressure without exophthalmos are described. Episcleral venous pressure measured on six unilateral cases showed increased pressure in the affected eye compared to the other eye and to normal controls. Two eyes had typical glaucomatous disc and visual field changes. Five had more optic disc cupping and pallor in the eye with the elevated episcleral venous pressure and intraocular pressure. A thorough work-up, including orbital venography in two unilateral cases, carotid arteriography in one and episcleral fluorescein angiography in five cases, failed to show venous obstruction or direct arterio-venous communications. The different diagnoses are discussed. This condition should be considered in unilateral or asymmetrical intraocular pressure elevation and in those patients with chronically red eyes without discharge.
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PMID:Increased pressure of dilated episcleral veins with open-angle glaucoma without exophthalmos. 686 49

Quigley's hypothesis indicates that the dense connective tissue is the least and the pores of the lamina cribrosa are the largest at the superior and inferior poles of the lamina cribrosa, therefore they are the most vulnerable locations to be involved by the characteristic glaucomatous optic nerve damage. To get clinical evidences of the hypothesis, the reversal or contraction of glaucomatous optic cup after reduction of intraocular pressure (IOP) was examined (The change is primarily caused by intraocular hypertension--induced distortion and posterior ectasia of the lamina cribrosa which moves forward reversely, leading to dilated optic cup contraction.). The method of examination was a stereoscopic flicker comparison with a computerized image system, alternatively displaying superposed 2 serial stereo pairs rapidly and the changing part presenting jumping appearance. Under stereoscopic observations, the changes of 3-dimension optic cup end be seen and the false positive phenomena caused by photographic angle variation, vascular pulsation, etc. can be differentiated from the characteristic changes of the cup. Stereo fundus photographs were taken from 31 eyes with high intraocular pressures before and after treatment for reduction of IOPs which was either diamox administration or trabeculectomy. The results show that the reversal of optic cups after reduction of IOPs are mostly asymmetrical, especially at the superior and/or inferior poles. By multiple stepwise regression, it is known that the amount of the change is only correlated with the initial IOP.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Characteristics of reversed optic cupping in glaucoma after reduction of intraocular pressure]. 784 9

In 35 patients with bilateral primary open-angle glaucoma (POAG), with asymmetrical evolution of the neuropticopathy between the two eyes, we compared within each patient, the response to ibopamine and the perimetric defect. In 88% of cases (31/35 patients) the eye with the most severe perimetric defect had high intraocular pressure or a larger IOP increase after ibopamine. This result was highly significant at the sign test (P < 0.001). IOP and its increase after ibopamine significantly differed in the most and least affected eye, being higher in the eye with the most impaired visual field. Since ibopamine can be used to quantify the hydrodynamic impairment, which is thus presumably correlated to the perimetric defect. This study further confirms its importance in the development of glaucomatous damage.
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PMID:Correlation between ocular hypertension induced by ibopamine and perimetric defect in primary open-angle glaucoma. 924 19

Focal production of pseudoexfoliative material is a stress to the endothelial cells, leading to a secondary degeneration and corneal decompensation. This typically occurs as a bilateral, asymmetrical, slowly progressive corneal endotheliopathy, more frequent in women, after the seventh decade of age. A severe decrease of endothelial cell density occurs--shown by specular microscopy. A persistent high level of the intraocular pressure and the metabolic disturbance in glaucoma affect the endothelium function. A severe decrease of the endothelial cell density occurs (up to 35%) in pseudoexfoliative keratopathy were glaucoma is associated.
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PMID:[Specular microscopy and pseudoexfoliative syndrome]. 1906 8

We report the rare occurrence of bilateral asymmetrical mucoceles of the paranasal sinuses that resulted in a unilateral orbital complication. The patient was a 47-year-old woman who presented with complaints of diplopia, blurred vision, and protrusion of her right eye that had progressed over a period of several months following an upper respiratory tract infection. Computed tomography detected the presence of two large, asymmetrical mucoceles. The lesion on the right involved the frontal and ethmoid sinuses, and the one on the left involved the ethmoid sinus. The mucoceles were locally expansile and had eroded the surrounding bony structures on the right. The expansile nature of the right-sided mass had displaced the right orbit, which was the cause of the vision deterioration. Transnasal endoscopic surgery was performed to excise and marsupialize the mucoceles. This modality was preferred over conventional open surgery because it affords good visualization, it is safe, and it is a less morbid procedure. The patient's recovery was uneventful, and she was discharged home on the third postoperative day. On continuing follow-up, her vision had improved, her intraocular pressure had returned to normal, and her orbits were in their normal position. Based on our literature search, no case of bilateral frontal and ethmoid sinus mucoceles has been previously reported.
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PMID:Bilateral asymmetrical mucoceles of the paranasal sinuses with unilateral orbital complications. 2132 15

Optical coherence tomography (OCT) provides a new dimenstion in ophthalmology because it allows evaluation of the pathology in vivo, and provides information to assist the management of macular disease and glaucoma. It is necessary to differentiate the diagnosis of glaucoma from diseases of the optic nerve and of the visual pathway. This study evaluates the usefulness of OCT in detecting disorders of the optic nerve and visual pathway. In addition, the pathogenesis of glaucomatous optic neuropathy (GON), the most common optic neuropathy, was investigated by focusing on the dynamics of aquaporin. I. Evaluation of optic nerve and visual pathway disorders by optical coherence tomography. The swinging flashlight test is an easy, sensitive, objective test to detect relative afferent pupillary defects (RAPD). The number of RAPD detected by the swinging flashlight test was closely correlated with the ratio of retinal nerve fiber layer thickness (RNFLT) between the two eyes of 20 cases of unilateral optic atrophy. OCT could assess the amount of RAPD that reflected an asymmetrical functional disturbance of the optic nerves, as a structural difference. The time courses of RNFLT and ganglion cell complex (GCC) changes' were observed immediately following the time of injury in 4 cases of traumatic optic neuropathy. OCT revealed that both the RNFLT and GCC decreased rapidly from 2 weeks after the injury until 20 weeks later. The RNFLT decreased significantly in the horizontal direction in comparison to the perpendicular direction in 34 eyes from the cases of optic chiasm syndrome. This means that OCT could quantitatively detect the band atrophy of the optic disc in optic chiasm syndrome. Measuring the RNFLT showed a thinning of RNFLT in the perpendicular direction in comparison to the horizontal direction in ipsilateral eyes and thinning in the horizontal direction in comparison to the perpendicular direction in the contralateral eyes in optic tract syndrome. Measuring the GCC showed a thinning of the GCC in the temporal hemifield to the central fovea of the ipsilateral eyes, and thinning of the GCC in the nasal hemifield of the contralateral eyes. This means that OCT could detect the structural changes of hourglass atrophy in the ipsilateral eye and band atrophy in the contralateral eye at the optic disc as well as the homonymous hemianopia in the visual field. OCT was useful in evaluating the optic nerve and visual pathway disorders, but there were also some limitations. The thinning area of RNFLT measured by OPTVue and Cirrus were in entirely opposite directions in cases of optic chasm syndrome. The reason was attributed to the better performance of RTVue in measuring a thin RNFLT on the nasal side of the optic disc in comparison to Cirrus. The specific characteristics of the instruments should be considered when the results of OCT are evaluated. II. Dynamics of aquaporin in the optic nerve Aquaporin (AQP) is a membrane protein that forms a water channel to facilitate water crossing the plasma membrane. AQP-4 was originally thought to be expressed in the optic nerve, but it is expressed only in the retrobulbar medullated region of the optic nerve and the expression of AQPs in the optic disc has not been detected. This study investigated the expressions of AQPs in the optic nerve in rat, monkey and human. The results demonstrate that only AQP-9 was expressed at the unmedullated pre-lamina cribrosa and lamina cribrosa regions, and both AQP-4 and AQP-9 were expressed at the medullated retrobulbar region. Astrocytes were observed to express AQP-9, because AQP-9 immunoreactivity was identical to that of glial fibrillary acidic protein. Elevated intraocular pressure substantially reduced AQP-9 expression in the optic nerve, whereas expression of AQP-4 was not changed in rat eyes. The same phenomena were also observed in the monkey eye with ocular hypertension as well as human eye with glaucoma. AQP-9 is an aquaglyceroporin that allows solutes such as lactate rather than water to cross the cell membrane. The astrocyte-to-neuron lactate shuttle hypothesis has been proposed, in which lactate transported from astrocytes is used by neurons as an energy substrate. Reduction of AQP-9 expression in the optic nerve head under elevated intraocular pressures might be closely related to the pathogenesis of GON.
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PMID:[New insights into the study of optic nerve diseases]. 2363 Dec 54

Currently, investigations of biomechanical properties of the fibrous tunic are becoming even more topical, especially for diagnosis of corneal ectatic disease, as well as correct interpretation of intraocular pressure (IOP) parameters, particularly in patients with prior surgery on cornea. The study principle is based on the ability of substances to change optical anisotropy depending on mechanical strain applied to them. An experimental set-up was constructed which allows assessment of polarization degree of light which is emitted during luminescence of strained collagen. The study was performed on 18 corneoscleral discs of chinchilla rabbit eyes at 15 and 50mm Hg pressure, among them in 6 cases before and after making radial incisions, and in 6 cases before and after conducting the mechanical cornea abrasions that were asymmetrical by depth until reaching the local zone of iatrogenic keratectasia. Corneal collagen mechanical strain mappings were formed on 3 experimental models (intact cornea, cornea post radial keratotomy and keratectasia) under intra-chamber pressure of 15 and 50mm Hg. Corneal collagen mechanical strain is evenly allocated in the intact cornea. After radial keratotomy the main mechanical loading was concentrated over the middle part of corneal periphery, particularly in the bottom of keratotomic incisions. The increased intra-chamber pressure made the strain rise in those models. Upon cornea abrasion the main straining is distributed within the thinning zone, and the increase of intra-chamber pressure only increases the load over residual stroma. A new principle of corneal biomechanical properties investigation based on assessment of degree of light polarization emitted during luminescence of strained collagen, has been proposed and experimentally tested.
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PMID:Experimental study on the mechanical strain of corneal collagen. 2368 Mar 49


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