Search results for "Ocular refraction"

showing 6 items of 6 documents

Accuracy and accommodation capability of a handheld autorefractor

2000

Purpose: To determine the accuracy of measurement by the Nikon Retinomax handheld autorefractor and its ability to relax accommodation. Setting: Pediatric Section, Department of Ophthalmology, University of Mainz, Germany. Methods: To perform a series of comparative measurements, autorefractor readings were obtained on healthy young adults (students) and on children aged 2 to 12 years. The autorefractor readings were compared with subjective refractions of the young adults and with cycloplegic retinoscopy of the children. Results: In adults, the accuracy of the handheld autorefractor measurements was comparable to that of conventional tabletop autorefractors. In children, the autorefractor …

AdultAgingmedicine.medical_specialtygenetic structuresOcular refractionRefraction OcularOcular physiologyReference ValuesOphthalmologymedicineHumansChildDioptreRetinoscopyElectronic Data Processingmedicine.diagnostic_testbusiness.industryVision TestsAutorefractorsAccommodation OcularReproducibility of ResultsCycloplegiaRefractive ErrorsSensory SystemsOphthalmologyAutorefractorChild PreschoolOptometrySurgerymedicine.symptombusinessAccommodationJournal of Cataract and Refractive Surgery
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Refraktion, Vorderkammertiefe, Dezentrierung und Tilt nach Implantation monofokaler und multifokaler Silikonlinsen

2001

Hintergrund. Ziel der prospektiven Studie war die Analyse von Refraktion, Vorderkammertiefe, Dezentrierung und Verkippung (Tilt) nach Implantation monofokaler (MONO) und multifokaler (MIOL) Intraokularlinsen (IOL). Patienten und Methode. Bei 103 Augen von 103 Patienten wurde entweder eine dreistuckige monofokale oder multifokale Silikon-IOL implantiert. Vorderkammertiefe (ACD), IOL-Dezentrierung und -Tilt wurden mittels Retroilluminationsfotografie und Scheimpflug-Aufnahmen objektiv quantifiziert. Die Untersuchungen einschlieslich Ermittlung der sujektiven Refraktion wurden praoperativ sowie postoperativ nach 1 Woche und nach 6 Monaten vorgenommen. Ergebnisse. Im Bereich von ±1 dpt um die Z…

GynecologyOphthalmologymedicine.medical_specialtybusiness.industrymedicineOcular refractionbusinessBiological effectDer Ophthalmologe
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Subjective Refraction Techniques in the Frame of the Three-Dimensional Dioptric Space

2001

A novel heuristic approach to the well-known representation of the dioptric power in a three-dimensional space is presented. It is shown how this theoretical framework is ideal for discussing the principles of several subjective refraction methods. In particular, this formalism is used to justify the stenopaic slit refraction, the Barnes subjective refraction technique, and the Jackson cross-cylinder procedure. In view of this analysis, some modifications to the traditional procedures are proposed.

Optics and Photonicsbusiness.industryPhysics::OpticsOcular refractionModels TheoreticalThree-dimensional spaceSubjective refractionRefractometryOphthalmologyFormalism (philosophy of mathematics)OpticsGraphicsbusinessAlgorithmOptometryVector spaceMathematicsOptometry and Vision Science
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Ergebnisse nach Implantation einer Worst Iris Claw Lens zur Korrektur der hohen Myopie

2001

Fragestellung. Ziel dieser prospektiven klinischen Studie war die Erfassung der Refraktion, des korrigierten Visus und des Vorderkammerreizzustandes nach Implantation einer Worst Iris Claw Lens zur Korrektur der hohen Myopie. Patienten und Methode. Von Dezember 1996 bis Februar 1999 wurde bei insgesamt 44 phaken Augen von 28 Patienten eine Worst Iris Claw Lens implantiert. Es folgte eine Nachbeobachtungszeit von 6 Wochen bzw. 6 Monaten. Ergebnisse. Das mittlere praoperative spharische Aquivalent betrug −17,35±3,57 dpt. Sechs Monate postoperativ lag die Refraktion bei 79% der Augen im Intervall von ±1,0 dpt von der Zielrefraktion entfernt. Der mittlere korrigierte Visus stieg von praoperativ…

medicine.medical_specialtyRefractive errorPolymethyl methacrylatebusiness.industrymedicine.medical_treatmentFollow up studiesIntraocular lensOcular refractionmedicine.diseaseVision disorderOphthalmologyOphthalmologymedicineProsthesis designmedicine.symptombusinessDer Ophthalmologe
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Heritability of anterior chamber depth and axial length: a population-based twin study among 66 to 79-year old female twins.

2014

ocular refractionAnterior ChamberInheritance PatternsPopulation basedBiologyheritabilityRefraction Ocular03 medical and health sciences0302 clinical medicineTwins DizygoticInheritance PatternsHumansGene–environment interaction030304 developmental biologyAgedGenetics0303 health sciencesGeneral MedicineAxial lengthta3142Twins MonozygoticHeritabilityTwin studyta3125OphthalmologyAxial Length Eye030221 ophthalmology & optometryFemaleGene-Environment InteractionDemographyActa ophthalmologica
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Akomodācijas un verģences sistēmas darbības traucējumu izplatība Azerbaidžānā

2020

Maģistra darb ir uzrakstīts angļu valodā uz 35 lpp. Tas satur 19 tabulas, 2 pielikumus un 16 atsauces uz literatūras avotiem. Maģistra darba mērķis ir izvērtēt akomodācijas un verģences traucējumu izplatību un veidus Azerbaidžānas galvaspilsētas baku studentu vidū. Pētījumā piedalījās 192 dalībnieki (15-36 g.v.). Visiem tika veikta bezmaksas redzes pārbaude, kur detalizēti tika izvērtēta refrakcija, akomodācija un verģence. Rezultāti parāda, ka 51 ± 4 % dalībniekiem novēro dažāda veida akomodācijas un verģences darbības traucējumus vai to kombinācijas. Visbiežāk novērotās problēmas ir akomodācijas ekscess un konverģences nepietiekamība. Netiek novērota dzimuma un vecuma ietekme uz akomodāci…

ocular refractionaccommodative dysfunctionsprevalenceFizikavergence dysfunctions
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