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Dr. Haya Al Farhan

Associate Professor

Associate Professor

كلية العلوم الطبية التطبيقية
225
publication
Journal Article
2004

A Fourier Method for Assessing Wrinkling and Fribrotic bands on the Posterior Capsule Following Cataract Surgery.

Horgan, C.C. Hull; H.M. Al–Farhan; R. Hameed; S.E. . 2004

article

Abstract

Purpose: To develop a Fourier method to assess wrinkling and other regular structure on the posterior capsule following cataract surgery

Methods: Digital images were recorded of eyes with posterior capsule opacification following cataract surgery using a Kodak DCS–100 digital camera system mounted on a Nikon FS–2 photo slit–lamp. Slit–lamp settings were a slit angle of 45o, beam width of 3mm, 25x magnification and a flash intensity of 2. Images were transfered to image processing software (Image Pro + v4.5.1, Media Cybernetics, Silver Spring, MD) and a 3 x 3mm area centred on the pupil selected. The Fourier Transform was taken and meridional data extracted from the amplitude spectrum image. The FourierTransform of a sine wave grating was used as a test function and fitted to data from all meridians. Data extracted from the fits were used to quantify the periodicity and orientation of any regular features in the original images.

Results: Amplitude spectra clearly indicated the presence and orientation of structure within images of the posterior capsule. Quantification proved possible for the small number of images tested (N = 5). However larger data sets should be examined to further confirm the initial findings and the possible utility of the method.

Conclusions: Initial results demonstrate that Fourier methods permit ready recognition of periodic structure on the posterior capsule. This may have application to studies of posterior capsule opacification where wrinkling is known to guide migration of lens epithelial cells or be due to the contractile nature of newly formed fibrocytes.

Publication Work Type
article
Volume Number
45
Issue Number
13
Magazine \ Newspaper
Investigative Ophthalmology & Visual Science .
Pages
1721
more of publication
publications

Abstract

Purpose: To develop a Fourier method to assess wrinkling and other regular structure on the posterior capsule following cataract surgery

by C.C. Hull; H.M. Al–Farhan; R. Hameed; S.E. Horgan
2004
publications

Purpose:  Posterior capsular opacification (PCO) is the commonest complication of cataract surgery. The aim of this work is to develop a system that could be used by primary care practitioners to…

by H. Al-Farhan1, C. C. Hull1, R. Hameed2, S. E. Horgan2 and E. G. Woodward1
2002
publications

Purpose: To compare the precision of central corneal thickness (CCT) measurements taken with the handheld ultrasound pachymeter (USP), ultrasound biomicroscopy (UBM), and the Artemis-2 very high…

by Al-Farhan HM1, Al-Otaibi WM.
2012