scholarly journals Human eye ocular component analysis for refractive state and refractive surgery

2017 ◽  
Keyword(s):  
Refractive Surgery ◽  
Component Analysis ◽  
Human Eye ◽  
Refractive State

Correlation between refractive state, corneal thickness, and keratometry in ametropic patients

2019 ◽  
Vol 30 (5) ◽  
pp. 891-896
Author(s):  
Amir Rosenblatt ◽  
Michael Mimouni ◽  
Tzahi Sela ◽  
Gur Munzer ◽  
David Varssano ◽  
...  
Keyword(s):  
Retrospective Analysis ◽  
Refractive Error ◽  
Refractive Surgery ◽  
Corneal Thickness ◽  
Spherical Equivalent ◽  
Moderate Correlation ◽  
Male And Female ◽  
Tel Aviv ◽  
Refractive State ◽  
Patient Demographics

Purpose: To analyze the correlation between age, gender, refractive error, keratometry, and corneal thickness in a large group of subjects. Methods: This study is a retrospective analysis of patients who underwent refractive surgery between January 2000 and February 2015 at Care Vision Refractive Clinic, Tel Aviv, Israel. Patient demographics, subjective refraction, pachymetry, and average keratometry were collected. Results: Overall, 51,113 eyes of patients averaging 28.8 ± 9.3 years of which 53.9% were males were included. Average keratometry, spherical equivalent and cylindrical error differed significantly between male and female subjects (p < 0.001), while pachymetry did not (p = 0.332). In myopic eyes, correlations between age, pachymetry, average keratometry, spherical equivalent, and cylindrical error were all statistically significant except for the correlation between age and either pachymetry (p = 0.462) or spherical equivalent (p = 0.016). All correlations found were negligible or small (|r|= 0.003 to 0.141). In hyperopic eyes, correlations between age, pachymetry, average keratometry, spherical equivalent, and cylindrical error were all statistically significant except for the correlation between average keratometry and either pachymetry or cylindrical error (p = 0.344 or p = 0.274, respectively). All correlations found were negligible or small, except for a moderate correlation found between age and cylindrical error (r = 0.365). Conclusion: Refractive state, pachymetry, and keratometry of refractive surgery candidates are mostly weakly correlated.

Relationship between minimum corneal thickness and refractive state, keratometry, age, sex, and left or right eye in refractive surgery candidates

2011 ◽  
Vol 37 (12) ◽  
pp. 2175-2180 ◽  
Author(s):  
Stephan J. Linke ◽  
Johannes Steinberg ◽  
Mau-Thek Eddy ◽  
Gisbert Richard ◽  
Toam Katz
Keyword(s):  
Refractive Surgery ◽  
Corneal Thickness ◽  
Refractive State

Investigating the action of the 193-nm and 223-nm radiation of excimer lasers on the cornea of the human eye in refractive surgery

2009 ◽  
Vol 76 (5) ◽  
pp. 263 ◽  
Author(s):  
A. M. Razhev ◽  
A. A. Zhupikov ◽  
D. S. Churkin ◽  
V. V. Chernykh ◽  
S. V. Kostenev
Keyword(s):  
Refractive Surgery ◽  
Excimer Lasers ◽  
Human Eye ◽  
193 Nm

Laser keratorefractive surgery. Russian technologies

2018 ◽  
Author(s):  
A.V. Doga ◽  
◽  
S.K. Vartapetov ◽  
I.A. Mushkova ◽  
S.V. Kostenyov ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Laser Radiation ◽  
Femtosecond Laser ◽  
Refractive Surgery ◽  
Physical Principle ◽  
Femtosecond Laser Radiation ◽  
Human Eye ◽  
History Of ◽  
Keratorefractive Surgery ◽  
The Creation

The monograph is devoted to the history of the creation of ophthalmic lasers and refractive surgery of the cornea in Russia. The physical principle of operation and interaction of femtosecond laser radiation with the cornea and other structures of the human eye is stated. A comparative analysis of the first Russian femtosecond device is presented.

A New System For Optomanual Semiautomatic Quantitative Image Analysis

1977 ◽  
Vol 35 ◽  
pp. 210-211
Author(s):  
H.P. Rohr
Keyword(s):  
Image Analysis ◽  
Volume Density ◽  
List Type ◽  
Distribution Analysis ◽  
Type Number ◽  
Point Counting ◽  
Human Eye ◽  
Quantitative Image ◽  
Point Density ◽  
Electronic Counting

Today, in image analysis the broadest possible rationalization and economization have become desirable. Basically, there are two approaches for image analysis: The image analysis through the so-called scanning methods which are usually performed without the human eye and the systems of optical semiautomatic analysis completely relying on the human eye.The new MOP AM 01 opto-manual system (fig.) represents one of the very promising approaches in this field. The instrument consists of an electronic counting and storing unit, which incorporates a microprocessor and a keyboard for choice of measuring parameters, well designed for easy use.Using the MOP AM 01 there are three possibilities of image analysis:the manual point counting,the opto-manual point counting andthe measurement of absolute areas and/or length (size distribution analysis included).To determine a point density for the calculation of the corresponding volume density the intercepts lying within the structure are scanned with the light pen.

A German version of the Intermittent Claudication Questionnaire (ICQ): cultural adaptation and validation

VASA ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 333-342 ◽  
Author(s):  
Kirchberger ◽  
Finger ◽  
Müller-Bühl
Keyword(s):  
Principal Component Analysis ◽  
Intermittent Claudication ◽  
Completion Time ◽  
Short Form ◽  
Principal Component ◽  
Component Analysis ◽  
German Version ◽  
Average Completion Time ◽  
Sf 36 ◽  
Related Quality

Background: The Intermittent Claudication Questionnaire (ICQ) is a short questionnaire for the assessment of health-related quality of life (HRQOL) in patients with intermittent claudication (IC). The objective of this study was to translate the ICQ into German and to investigate the psychometric properties of the German ICQ version in patients with IC. Patients and methods: The original English version was translated using a forward-backward method. The resulting German version was reviewed by the author of the original version and an experienced clinician. Finally, it was tested for clarity with 5 German patients with IC. A sample of 81 patients were administered the German ICQ. The sample consisted of 58.0 % male patients with a median age of 71 years and a median IC duration of 36 months. Test of feasibility included completeness of questionnaires, completion time, and ratings of clarity, length and relevance. Reliability was assessed through a retest in 13 patients at 14 days, and analysis of Cronbach’s alpha for internal consistency. Construct validity was investigated using principal component analysis. Concurrent validity was assessed by correlating the ICQ scores with the Short Form 36 Health Survey (SF-36) as well as clinical measures. Results: The ICQ was completely filled in by 73 subjects (90.1 %) with an average completion time of 6.3 minutes. Cronbach’s alpha coefficient reached 0.75. Intra-class correlation for test-retest reliability was r = 0.88. Principal component analysis resulted in a 3 factor solution. The first factor explained 51.5 of the total variation and all items had loadings of at least 0.65 on it. The ICQ was significantly associated with the SF-36 and treadmill-walking distances whereas no association was found for resting ABPI. Conclusions: The German version of the ICQ demonstrated good feasibility, satisfactory reliability and good validity. Responsiveness should be investigated in further validation studies.

A component analysis of cognitive-behavioral treatment for depression.

2000 ◽  
Vol 3 ◽  
pp. np
Author(s):  
Keith S. Dobson ◽  
Paula A. Truax ◽  
Michael E. Addis ◽  
Kelly Koerner ◽  
Jackie K. Gollan ◽  
...  
Keyword(s):  
Behavioral Treatment ◽  
Component Analysis ◽  
Cognitive Behavioral ◽  
Cognitive Behavioral Treatment
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