Results 41 to 50 of about 3,616,800 (230)

Refractive Errors in Koreans: The Korea National Health and Nutrition Examination Survey 2008-2012

Korean Journal of Ophthalmology, 2016
Purpose Our study provides epidemiologic data on the prevalence of refractive errors in all age group ≥5 years in Korea. Methods In 2008 to 2012, a total of 33,355 participants aged ≥5 years underwent ophthalmologic examinations.
T. Rim, Seung-Hyun Kim, K. Lim, M. Choi, Hye Young Kim, Seung-Hee Baek   +5 more
semanticscholar   +1 more source

The normal distribution of corneal eccentricity and its determinants in two rural areas of north and south of Iran

Journal of Current Ophthalmology, 2018
Purpose: The aim of this study was to determine the distribution of corneal eccentricity (E-value) in a normal population and to examine related factors.
Samira Heydarian, Hassan Hashemi, Fereshteh Shokrollahzadeh, Abbas Ali Yekta, Hadi Ostadimoghaddam, Akbar Derakhshan, Mehdi Khabazkhoob   +6 more
doaj   +1 more source

Calculating the error in refractive error [PDF]

Eye, 2011
To demonstrate a quick way of calculating the optical difference between two refractions using vector analysis, and to express this as a score for examination purposes.An existing formula is applied, converted to a defocus equivalent, and then converted to a score.
R H, Taylor, R B, Ellingham, S, Subramaniam, L A, Wakely   +3 more
openaire   +2 more sources

Refractive Errors and Concomitant Strabismus: A Systematic Review and Meta-analysis

Scientific Reports, 2016
This systematic review and meta-analysis is to evaluate the risk of development of concomitant strabismus due to refractive errors. Eligible studies published from 1946 to April 1, 2016 were identified from MEDLINE and EMBASE that evaluated any kinds of ...
S. Tang, R. Chan, Shi Bin Lin, S. Rong, H. H. Lau, Winnie W. Y. Lau, W. Yip, L. J. Chen, Simon T. C. Ko, J. C. Yam   +9 more
semanticscholar   +1 more source

Repeatability and Agreement of Anterion with Pentacam HR and Orbscan II in Corneal Parameters after Photorefractive Keratectomy

Dubai Medical Journal
Introduction: This study aimed to evaluate the repeatability and agreement of Anterion with Pentacam HR and Orbscan II in corneal parameters after photorefractive keratectomy (PRK).
Hadi Ostadi-Moghaddam, Javad Heravian Shandiz, Mohammad Hosein Validad, Monireh Mahjoob, Abbas Ali Yekta, Sadegh Basharaf, Tahereh Rakhshandadi   +6 more
doaj   +1 more source

Refractive errors among commercial drivers

Indian Journal of Ophthalmology, 2022
Purpose: To determine the pattern of refractive error among commercial drivers in north India. Methods: Descriptive study with convenient sampling conducted among commercial drivers of north India. Results: A total of 213 (75.8%) heavy-vehicle and 68 (24.
Mukesh Kumar, Aarti Mahaseth, Shafia Parveen, Uzma Rafeeq, Lokesh Chauhan   +4 more
doaj   +1 more source

Using aircraft measurements to determine the refractive index of Saharan dust during the DODO Experiments [PDF]

, 2010
Much uncertainty in the value of the imaginary part of the refractive index of mineral dust contributes to uncertainty in the radiative effect of mineral dust in the atmosphere.
Formenti, P, Harrison, M. A. J., Highwood, E. J., McConnell, C. L.   +3 more
core   +1 more source

Five-Year Progression of Refractive Errors and Incidence of Myopia in School-Aged Children in Western China

Journal of Epidemiology, 2016
Background To determine the change in refractive error and the incidence of myopia among school-aged children in the Yongchuan District of Chongqing City, Western China.
Wen-jun Zhou, Yong-ye Zhang, Hua Li, Yu-fei Wu, Ji Xu, Sha Lv, Ge Li, Shichun Liu, Shengfang Song   +8 more
semanticscholar   +1 more source

A simple opto-fluidic switch detecting liquid filling in polymer-based microfluidic systems [PDF]

, 2007
A novel detection scheme for detection of liquid levels and bubbles in microfluidic systems, using the principle of total internal reflection (TIR) is presented. A laser beam impinges on the side walls of a channel which are inclined at 45deg.
Bundgaard, F., Ducrée, Jens, Geschke, O., Zengerle, Roland   +3 more
core   +2 more sources

Eye problems in children with hearing impairment

Journal of Current Ophthalmology, 2015
Purpose: To compare the prevalence of refractive errors, amblyopia, and strabismus between hearing-impaired and normal children (7–22 years old) in Mashhad.
Hadi Ostadimoghaddam, Hanieh Mirhajian, AbbasAli Yekta, Davood Sobhani Rad, Javad Heravian, Azam Malekifar, Mehdi Khabazkhoob   +6 more
doaj   +1 more source