PMID: 9547805Apr 21, 1998Paper

Influence of spatial distribution with blur on fluctuations in accommodation

Optometry and Vision Science : Official Publication of the American Academy of Optometry
K Niwa, T Tokoro

Abstract

We investigated the influence of spatial distribution of retinal image with blur on the waveform of microfluctuations in accommodation. We studied changes in accommodation in 8 young emmetropic subjects (21.88 +/- 2.36 years old), who viewed monocularly a target with the natural pupil. The spatial frequency of the target was varied from 0.85 to 15 cpd in 7 steps, and the blur intensity was increased in 7 steps to obtain a Gaussian distribution of retinal image. Continuous accommodation signals were recorded using an eye-tracking infrared optometer with a sampling frequency of 40.98 Hz, and analyzed with a fast Fourier transform (FFT) analyzer. The power spectra of the low frequency component (LFC, < 0.6 Hz) and the high frequency component (HFC) at approximately 1.9 Hz were calculated for each target with a frequency resolution of 0.02 Hz. Microfluctuations in accommodation increased as the blur was increased and decreased at further increases in blur intensity level. Microfluctuations peaked at a lower blur level as the spatial frequency was increased. Power spectral analysis revealed that these changes in the microfluctuations could be attributed mainly to increases of power in the LFC. Blurring of the edge and reduction in c...Continue Reading

Citations

May 7, 2009·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Kristin E SchultzMelissa D Bailey
Feb 12, 2011·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Vidhyapriya SreenivasanWilliam R Bobier
Jun 10, 2011·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Niall C StrangDirk Seidel
Apr 28, 2006·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Karen M HampsonEdward A H Mallen
Nov 13, 2004·IEEE Transactions on Bio-medical Engineering·D Robert IskanderMingxia Zhu
Aug 26, 2015·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·W Neil Charman, Gordon Heron
Jun 24, 2017·Bulletin of Mathematical Biology·Karen M HampsonEdward A H Mallen
Sep 8, 2018·Journal of Vision·Steven A CholewiakMartin S Banks
Jan 19, 2008·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Mhairi DayLyle S Gray
Oct 4, 2008·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Matthew P Cufflin, Edward A H Mallen
Nov 13, 2009·Optics Express·Karen M HampsonEdward A Mallen
Jul 27, 2005·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Katrina L SchmidBrian Brown
Jan 5, 2006·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Mhairi DayEdward A H Mallen
Jul 12, 2019·Translational Vision Science & Technology·Jingjing XuHao Chen

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