فهرست مطالب mansoureh bagheri

To evaluate corneal biomechanics using Corvis ST in healthy eyes from Iranian keratorefractive surgery candidates.

In this prospective consecutive observational case series, the intraocular pressure (IOP), central corneal thickness (CCT), and biomechanical properties of 1,304 eyes from 652 patients were evaluated using Corvis ST. Keratometric readings and manifest refraction were also recorded.

The mean (±SD) age of participants was 28 ± 5 years, and 31.7% were male. The mean spherical equivalent refraction was –3.50 ± 1.57 diopters (D), the mean IOP was 16.8 ± 2.9 mmHg, and the mean CCT was 531 ± 31 μm for the right eye. The respective means (±SD) corneal biomechanical parameters of the right eye were as follows: first applanation time: 7.36 ± 0.39 milliseconds (ms); first applanation length: 1.82 ± 0.22 mm; velocity in: 0.12 ± 0.04 m/s; second applanation time: 20.13 ± 0.48 ms; second applanation length: 1.34 ± 0.55 mm; velocity out: –0.67 ± 0.17 m/s; total time: 16.84 ± 0.64 ms; deformation amplitude: 1.05 ± 0.10 mm; peak distance: 4.60 ± 1.01 mm; and concave radius of curvature: 7.35 ± 1.39 mm. In the linear regression analysis, IOP exhibited a statistically significant association with the first and second applanation times, total time, velocity in, peak distance, deformation amplitude, and concave radius of curvature.

Our study results can be used as a reference for the interpretation of Corvis ST parameters in healthy refractive surgery candidates in the Iranian population. Our results confirmed that IOP is a major determinant of Corvis parameters.

Policies applied by every institution or organization identify strategies for their activities and make the employees aware of the scope of their duties and powers. In each policy, there are some standards and elements which are affected by the activities, goals and duties of the related institutions or organizations. This study aimed to identify the present criteria and elements of policies in accessing the manuscript sections in Iran’s libraries and to analyze the perspectives of the creators of these policies. Design/ Methodology/Approach: In this research, the method of qualitative content analysis is applied to analyze the policy of services and access to the manuscript section of in Iran’s libraries. There are nine elements in manuscript services and access policies in Iran’s libraries. Each element contains different categories and subcategories. Having only four elements, the Central library of the University of Tehran had the lowest number of elements and criteria, while the National Library of Iran has all of the identified elements and criteria. This study concluded that each element had different levels of importance in different policies. Based on the findings, two elements i.e. providing resources and services to clients, and the conditions and specifications of the clients were the most important and basic elements in determining the policies. These two elements are considered in all of the presently compiled policies.

Weblogs are among the noteworthy new forms of information provision on the web. According to the studies conducted up to now (June 16, 2010), 222 Iranian up-to-date library and information weblogs have been registered, with librarians studying them constantly to obtain the most recent information on library and information science. The purpose of the present study is to provide a checklist of evaluation criteria of library and information weblogs. Design/methodology/approach: Having reviewed the study literature, and considered the unanimous opinion of research experts, the authors considered 23 criteria for the evaluation of Iranian libraries and information weblogs. Then Cronbach’s Alpha 0.76 coefficient of checklist question correlation was extracted, and the reliability of the criteria checklist proposed by this study was established. The criteria gathered from specialized texts and study literature was also analyzed by seven experts who have introduced new theories regarding library and information weblogs, resulting in the validation of the checklist. Afterwards, the importance coefficient for each criterion was extracted after consideration of different expert opinions on the coefficient. The most important finding of the present study is the 23 criteria checklist for Iranian library and information weblogs in which the degree of importance of each criterion has been specified. The criterion “Weblog updating” with an importance degree of 5 has the highest coefficient, while the criteria “Questionnaire citation” and “Web Impact Factor” have a shared degree of importance (3.1) and so have the lowest coefficient for the evaluation of Iranian library and information weblogs.