ORCID Profile
0000-0002-5340-1225
Current Organisations
Australian College of Optometry
,
Eye Focus Optometry
,
UNSW Australia
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Publications
Performance of the holographic multivergence target in the subjective measurement of spherical refractive error and amplitude of accommodation of the human eye
Publisher: Optica Publishing Group
Date: 06-09-2007
Abstract: We recently suggested the use of a holographic multivergence target to measure the spherical refractive error and the litude of accommodation of the human eye [K. V. Avudainayagam and C. S. Avudainayagam, Opt. Lett.28, 123 (2003)]. In this paper we report the performance of the holographic target in measuring real eyes. The holographic technique compared well with subjective refraction and autorefraction in the measurement of spherical refractive error. The performance of the holographic technique in measuring the litude of accommodation was similar to that of the minus lens to blur method and that of the push-up method. These results promote holography as a promising technique for testing human vision.
An experimental investigation of the vision of hyperopes and myopes using a hologram
Publisher: The Optical Society
Date: 02-05-2012
DOI: 10.1364/BOE.3.001173
Holographic Refraction and the Measurement of Spherical Ametropia
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 10-2016
DOI: 10.1097/OPX.0000000000000950
Abstract: To evaluate the performance of a holographic logMAR chart for the subjective spherical refraction of the human eye. Bland-Altman analysis was used to assess the level of agreement between subjective spherical refraction using the holographic logMAR chart and conventional autorefraction and subjective spherical refraction. The 95% limits of agreement (LoA) were calculated between holographic refraction and the two standard methods (subjective and autorefraction). Holographic refraction has a lower mean spherical refraction when compared to conventional refraction (LoA 0.11 ± 0.65 D) and when compared to autorefraction (LoA 0.36 ± 0.77 D). After correcting for systemic bias, this is comparable between autorefraction and conventional subjective refraction (LoA 0.45 ± 0.79 D). After correcting for differences in vergence distance and chromatic aberration between holographic and conventional refraction, approximately 65% (group 1) of measurements between holography and conventional subjective refraction were similar (MD = 0.13 D, SD = 0.00 D). The remaining 35% (group 2) had a mean difference of 0.45 D (SD = 0.12 D) between the two subjective methods. Descriptive statistics showed group 2’s mean age (21 years, SD = 13 years) was considerably lower than group 1’s mean age (41 years, SD = 17), suggesting accommodation may have a role in the greater mean difference of group 2. Overall, holographic refraction has good agreement with conventional refraction and is a viable alternative for spherical subjective refraction. A larger bias between holographic and conventional refraction was found in younger subjects than older subjects, suggesting an association between accommodation and myopic over-correction during holographic refraction.
Role of Mandelbaum-like effect in the differentiation of hyperopes and myopes using a hologram
Publisher: SPIE-Intl Soc Optical Eng
Date: 07-08-2013
Related Organisations
Related Funding Activities
No related grants have been discovered for Nicholas Hoai Nam Nguyen.