Subjective and objective measurement of human accommodative amplitude

Wold, Jon; Hu, Annie; Chen, Stephanie; Glasser, Adrian

doi:10.1016/s0886-3350(03)00667-9

Cited by 114 publications

(99 citation statements)

References 38 publications

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“…23 Duane's results have been slightly modified because his data were referred to the spectacle plane (placed 12 mm in front of the eye) and reduced by 20% due to the overestimated values yielded by the push-up method relative to those yielded by the minus-lenses method. 24 Figures 2 and 3 indicate that the subjective data collected by two independent methods are internally consistent and in broad agreement with published norms for the human eye. Figure 4 shows an example of the accommodation response curves for each of the 32 metrics, for a 23-year-old subject.…”

Section: Amplitude Of Accommodation Minus Lenses (D) Amplitude Of Accsupporting

confidence: 79%

“…Although a subjective test provides important information about near visual ability, it does not accurately measure the accommodative optical change that occurs in the eye. This is because the eye's depth-of-field causes subjective measurements to overestimate the objectively measured accommodative amplitude 4,5 unencumbered by depth-of-field effects. For example, open-field-of-view autorefractors [6][7][8][9] are commonly used to obtain accurate, objective measurements of accommodation.…”

Section: Introductionmentioning

confidence: 99%

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Objective Amplitude of Accommodation Computed from Optical Quality Metrics Applied to Wavefront Outcomes

López‐Gil

Fernández-Sánchez

Thibos

et al. 2009

Journal of Optometry

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PURPOSE:We studied the accuracy and precision of 32 objective wavefront methods for finding the amplitude of accommodation obtained in 180 eyes. METHODS: Ocular accommodation was stimulated with 0.5 D steps in target vergence spanning the full range of accommodation for each subject. Subjective monocular amplitude of accommodation was measured using two clinical methods, using negative lenses and with a custom Badal optometer. RESULTS Both subjective methods gave similar results. Results obtained from the Badal optometer where used to test the accuracy of the objective methods. All objective methods showed lower amplitude of accommodation that the subjective ones by an amount that varied from 0.2 to 1.1 D depending on the method. The precision in this prediction also varied between subjects, with an average standard error of the mean of 0.1 D that decreased with age. CONCLUSIONS: Depth of field increases subjective of amplitude of accommodation overestimating the objective amplitude obtained with all the metrics used. The change in the negative direction of spherical aberration during accommodation increases the amplitude of accommodation by an amount that varies with age. KEY WORDS: image quality metrics; amplitude of accommodation; presbyopia; subjective methods; objective methods. RESUMEN OBJETIVO:Estudiamos la exactitud y la precisión de 32 métodos objetivos de calidad de imagen aplicados al frente de onda ocular y utilizados para calcular la amplitud de acomodación en 180 ojos. MÉTODOS: Se estimuló la acomodación ocular modificando la vergencia del estímulo a pasos de 0,5 D, de forma que se cubriese todo el rango de acomodación de cada sujeto. Se midió la amplitud de acomodación monocular subjetiva utilizando dos métodos habituales en la práctica clínica: uno basado en el uso de lentes negativas y otro basado en un optómetro de Badal adaptado. RESULTADOS: Con ambos métodos subjetivos se obtuvieron resultados parecidos. Los resultados obtenidos con el método basado en el optómetro de Badal se utilizaron para evaluar la exactitud de los métodos objetivos. En todos los casos, con todos los métodos objetivos se obtuvo una menor amplitud de acomodación que con los subjetivos; la diferencia entre ambos tipos osciló entre 0,2 D y 1,1 D, dependiendo de cada sujeto concreto. La precisión de esta estimación también varió entre un sujeto y otro: el error estándar de la media fue, en promedio, igual a 0,1 D, disminuyendo con la edad. CONCLUSIONES: La profundidad de campo aumenta la amplitud de acomodación subjetiva que sobrestima los valores objetivos encontrados por cualquiera de las métodos objetivos usados. Los resultados indican que la variación, hacia valores más negativos, de la aberración esférica durante el proceso de acomodación hace que aumente la amplitud de acomodación en una cantidad que varía con la edad. PALABRAS CLAVE: métricas de calidad de imagen; amplitud de acomodación; presbicia; métodos subjetivos; métodos objetivos.

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Section: Amplitude Of Accommodation Minus Lenses (D) Amplitude Of Accsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Objective Amplitude of Accommodation Computed from Optical Quality Metrics Applied to Wavefront Outcomes

López‐Gil

Fernández-Sánchez

Thibos

et al. 2009

Journal of Optometry

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“…[6][7][8][9][10][11][12] Keep in mind that the normal range usually applied was obtained from the method of calculation of Donders in emmetropic subjects, if these values are compared with ametropic subjects to determine if the amplitude of accommodation that is obtained is normal, you should perform the calculation considering the effect of neutralizing lens (Am eye ).…”

Section: Discussionmentioning

confidence: 99%

“…Several pilot studies have been done to determine the value of the amplitude of accommodation by different methods, and found that the values obtained by the push-up method provided higher values than other methods. [6][7][8][9][10][11][12] It is therefore important to evaluate how precise in the subjective measurement of the amplitude of accommodation and, if necessary, refine it.…”

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confidence: 99%

Analysis of the calculation of the amplitude of accommodation

Coloma

Sáiz

Pascual

et al. 2016

Optik

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The push-up method is routinely used to measure the amplitude of accommodation. In this method the diopter value corresponding to the nearest point that the eye can focus is determined, wearing his neutralizing lens, but not the value of the maximum diopter variation that makes the eye.The aim of this paper is to review the calculation described in the push-up method taking into account the real position of the near point of the eye.In the subjective push-up method, it is calculated the reciprocal of the distance from the lens until the test object at this position of first, slight, sustained blur.We calculated the differences between this value and the ocular amplitude of accommodation, taking into account that the eye is really looking at the image of first blur through the neutralizing lens.Experimental measurements were also taken to determine whether they were similar to theoretical values.The results obtained by the two calculation methods compared were in general significantly different and the difference was greater for young people with high

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“…For instance, accommodation can be tested with a number of techniques [48], and participants reported using several different methods. Our finding that the optometrists did not reach agreement on specific oculomotor and BV testing methods does not detract from the importance of conducting the testing in mTBI.…”

Section: Examination Procedures Testmentioning

confidence: 99%

Development of a mild traumatic brain injury-specific vision screening protocol: A Delphi study

et al. 2013

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Abstract-Although traumatic brain injury (TBI) can happen to anyone at any time, the wars in Iraq and Afghanistan have brought it renewed attention. Fortunately, most cases of TBI from the recent conflicts are mild TBI (mTBI). Still, many physical, psychological, and social problems are associated with mTBI. Among the difficulties encountered are oculomotor and vision problems, many of which can impede daily activities such as reading. Therefore, correct diagnosis and treatment of these mTBI-related vision problems is an important part of patient recovery. Numerous eye care providers in the Department of Veterans Affairs, in military settings, and in civilian practices specialize and are proficient in examining patients who have a history of TBI. However, many do not have this level of experience working with and treating patients with mTBI. Recognizing this, we used a modified Delphi method to derive expert opinions from a panel of 16 optometrists concerning visual examination of the patient with mTBI. This process resulted in a clinical tool containing 17 history questions and 7 examination procedures. This tool provides a set of clinical guidelines that can be used as desired by any eye care provider either as a screening tool or adjunct to a full eye examination when seeing a patient with a history of mTBI. The goal of this process was to provide optimal and uniform vision care for the patient with mTBI.Key words: accommodation, binocular vision, consensus, convergence insufficiency, Delphi method, mild traumatic brain injury, oculomotor, optometrist, traumatic brain injury, visual symptoms. Abbreviations

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Subjective and objective measurement of human accommodative amplitude

Cited by 114 publications

References 38 publications

Objective Amplitude of Accommodation Computed from Optical Quality Metrics Applied to Wavefront Outcomes

Objective Amplitude of Accommodation Computed from Optical Quality Metrics Applied to Wavefront Outcomes

Analysis of the calculation of the amplitude of accommodation

Development of a mild traumatic brain injury-specific vision screening protocol: A Delphi study

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