Performance of the holographic multivergence target in the subjective measurement of spherical refractive error and amplitude of accommodation of the human eye

Avudainayagam, Kodikullam V.; Avudainayagam, Chitralekha S.; Nguyen, Nicholas; Chiam, Kian W.; Truong, Cann

doi:10.1364/josaa.24.003037

Cited by 5 publications

(2 citation statements)

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“…As the distance corrected vision through the logMAR hologram is worse for younger hyperopes as compared with the older hyperopes, this seems to suggest that the latent hyperopia is in play when hyperopic subjects view through the logMAR hologram. This is consistent with our initial findings reported in our earlier paper 10 that it may be possible to get a measure of hyperopia without the intervention of latent accommodation using the multivergence hologram. Table 12 also lists the Pearson correlation coefficient between the pupil size and the logMAR value for various refractive groups.…”

Section: Discussionsupporting

confidence: 93%

“…10 In this measurement, an uncorrected eye viewing a distant fixation target in white light is presented briefly (in flashes of about 1 s duration) with the multivergence hologram and the most positive number seen clearly by the subject gives a measure of his/her refractive error. 10 When a spectacle corrected eye is presented with such a multivergence hologram in total darkness, we believe that the clearest number seen would give a measure of his/her dark focus.…”

Section: Discussionmentioning

confidence: 99%

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Role of Mandelbaum-like effect in the differentiation of hyperopes and myopes using a hologram

Nguyen

Avudainayagam

2013

J. Biomed. Opt

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Abstract. Recently, we tested the vision of spectacle corrected subjects using a special hologram (http://dx.doi.org/ 10.1364/BOE.3.001173). A subject viewing through this hologram sees the images of various numbers at different distances from the eye. Each of these images subtends an angle of 50 0 at the eye. Each image corresponds to a different amount of divergence or convergence at the eye. The limit of convergence (positive blur) with which a subject can recognize the numbers was measured. Hyperopes could recognize numbers with 0.9 D more of positive blur in comparison with myopes. This difference was not obtained with a standard test chart under white light illumination using positive lenses to provide the blur. The observed difference with the hologram is then attributed to the multivergence nature of the target in the hologram and/or the monochromaticity of the illumination used. Using a hologram of a logMAR chart at a single distance of infinity we have now found that the observed difference is induced by the multivergence target and is due to an effect that is similar to the Mandelbaum effect. We present the details of this experiment and compare the results obtained with our earlier experiment. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Role of Mandelbaum-like effect in the differentiation of hyperopes and myopes using a hologram

Nguyen

Avudainayagam

2013

J. Biomed. Opt

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Holographic Refraction and the Measurement of Spherical Ametropia

Nguyen¹

2016

Optom Vis Sci

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An experimental investigation of the vision of hyperopes and myopes using a hologram

Nguyen¹,

Avudainayagam²,

Avudainayagam³

2012

Biomed. Opt. Express

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A hologram of a specially designed multivergence target which displays real and virtual objects (numbers) simultaneously has been used to test the vision of various spectacle corrected subjects. Through the hologram, the subjects see standard ‘60-meter’ numbers that have different amounts of blur. It is found that there is a difference between myopes and hyperopes in the amount of positive blur with which they can recognize numbers seen through the hologram and this difference is statistically significant. A similar study was then conducted in white light illumination using the ‘60-meter’ numbers of a standard test chart at 6 meter distance and positive lenses to provide the blur at the eye. This study showed no difference between the refractive groups. Our results indicate that hyperopes may be relaxing their accommodation more than myopes in viewing through the hologram.

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Performance of the holographic multivergence target in the subjective measurement of spherical refractive error and amplitude of accommodation of the human eye

Cited by 5 publications

References 4 publications

Role of Mandelbaum-like effect in the differentiation of hyperopes and myopes using a hologram

Role of Mandelbaum-like effect in the differentiation of hyperopes and myopes using a hologram

Holographic Refraction and the Measurement of Spherical Ametropia

An experimental investigation of the vision of hyperopes and myopes using a hologram

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