نتایج جستجو برای: aberrations
تعداد نتایج: 17220 فیلتر نتایج به سال:
This study investigated differences in geometrical properties and optical aberrations between a group of hyperopes and myopes (age-matched 30.3+/-5.2 and 30.5+/-3.8 years old, respectively, and with similar absolute refractive error 3.0+/-2.0 and -3.3+/-2.0, respectively). Axial length (AL) was measured by means of optical biometry, and corneal apical radius of curvature (CR) and asphericity (Q...
Most mutagens and genotoxic carcinogens are efficient inducers of chromosomal alterations in exposed cells. Two important classes of aberrations, namely structural and numerical, are recognized and both types of aberrations are associated with congenital abnormalities and neoplasia in humans. These alterations can be easily detected and quantified in human peripheral blood lymphocytes. Conventi...
AIM To compare the optical outcomes of biaxial microincision cataract surgery (B-MICS) versus coaxial small-incision cataract surgery (C-SICS). METHODS Thirty patients (sixty eyes) with bilateral age-related cataract underwent B-MICS through a 1.7 mm clear corneal incision (CCI) in one eye and C-SICS through a 2.8-mm CCI in the other eye. Every eye was implanted with a micro-incision aspheric...
Higher-order monochromatic aberrations in the human eye cause a difference in the appearance of stimuli at distances nearer and farther from best focus that could serve as a signed error signal for accommodation. We explored whether higher-order monochromatic aberrations affect the accommodative response to 0.5 D step changes in vergence in experiments in which these aberrations were either pre...
ABSTRACT The increasing use of medical herbs and their products and the proof of mutagenicity and oncogenicity of some of their components justify more researches about these effects of herb products. The objective of the present study is to explore the cytogenetic toxicity of a product currently available in Iranian drug market called Antimigrin. One of the methods used for the study of mutag...
This paper reports on results of intracytoplasmic sperm injection (ICSI) in patients in whom constitutional or secondary chromosome aberrations were detected in the male and/or female partner. Out of 434 couples treated by ICSI (590 cycles), 16 couples (3.7%) were affected by constitutional chromosome aberrations and 96 (22.1%) by secondary chromosome aberrations. Constitutional chromosome aber...
A high level of chromosomal aberrations in peripheral blood lymphocytes may be an early marker of cancer risk, but data on risk of specific cancers and types of chromosomal aberrations (chromosome type and chromatid type) are limited. A total of 6,430 healthy individuals from nine laboratories in Croatia, Hungary, Lithuania, Poland, and Slovakia, included in chromosomal aberration surveys perfo...
T has been known for some time that there are differences in the radiationI induced chromosomal aberrations observed at metaphase, according to the stage of the cell cycle the cells were in at the time of irradiation (SWANSON 1957). The observed differences are not only quantitative (changes in frequency per cell), but are also qualitative in that, depending on the stage and the chromosomal stm...
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