Dynamics of the accommodation response to abrupt changes in target vergence as a function of age

Gordon Heron, W. N. Charman, C. Schor

Research output: Contribution to journalArticle

Abstract

The dynamic accommodation responses to small, abrupt changes in an accommodation stimulus were studied in two experiments. In the first, responses of 19 subjects with ages distributed between 18 and 49 years were measured for step stimuli of ±1.05 D. In the second, responses to small step stimuli (±0.75, ±1.75 D) were recorded for a group of six ‘young’ (mean age 22, range 16–26 years) and six ‘old’ (mean age 42, range 36–48 years) subjects. In both experiments, the low target vergences always lay within the accommodation range of all subjects. Whether the data were analysed in terms of simple reaction and response times, or in terms of the frequency response, no marked systematic changes with age were found in the dynamics of the response in either of the experiments. It is concluded that, for small stimuli within the amplitude of accommodation, the response dynamics over the adult age range studied remain remarkably constant, even though the amplitude progressively reduces with age as complete presbyopia is approached.

Original languageEnglish
JournalVision Research
DOIs
Publication statusPublished - 1 Feb 2001

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Presbyopia

Keywords

  • accommodation dynamics
  • vision science
  • presbyopia

Cite this

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title = "Dynamics of the accommodation response to abrupt changes in target vergence as a function of age",
abstract = "The dynamic accommodation responses to small, abrupt changes in an accommodation stimulus were studied in two experiments. In the first, responses of 19 subjects with ages distributed between 18 and 49 years were measured for step stimuli of ±1.05 D. In the second, responses to small step stimuli (±0.75, ±1.75 D) were recorded for a group of six ‘young’ (mean age 22, range 16–26 years) and six ‘old’ (mean age 42, range 36–48 years) subjects. In both experiments, the low target vergences always lay within the accommodation range of all subjects. Whether the data were analysed in terms of simple reaction and response times, or in terms of the frequency response, no marked systematic changes with age were found in the dynamics of the response in either of the experiments. It is concluded that, for small stimuli within the amplitude of accommodation, the response dynamics over the adult age range studied remain remarkably constant, even though the amplitude progressively reduces with age as complete presbyopia is approached.",
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note = "Originally published in: Vision Research (2002), 41 (4), pp.507-519.",
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Dynamics of the accommodation response to abrupt changes in target vergence as a function of age. / Heron, Gordon; Charman, W. N.; Schor, C.

In: Vision Research, 01.02.2001.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dynamics of the accommodation response to abrupt changes in target vergence as a function of age

AU - Heron, Gordon

AU - Charman, W. N.

AU - Schor, C.

N1 - Originally published in: Vision Research (2002), 41 (4), pp.507-519.

PY - 2001/2/1

Y1 - 2001/2/1

N2 - The dynamic accommodation responses to small, abrupt changes in an accommodation stimulus were studied in two experiments. In the first, responses of 19 subjects with ages distributed between 18 and 49 years were measured for step stimuli of ±1.05 D. In the second, responses to small step stimuli (±0.75, ±1.75 D) were recorded for a group of six ‘young’ (mean age 22, range 16–26 years) and six ‘old’ (mean age 42, range 36–48 years) subjects. In both experiments, the low target vergences always lay within the accommodation range of all subjects. Whether the data were analysed in terms of simple reaction and response times, or in terms of the frequency response, no marked systematic changes with age were found in the dynamics of the response in either of the experiments. It is concluded that, for small stimuli within the amplitude of accommodation, the response dynamics over the adult age range studied remain remarkably constant, even though the amplitude progressively reduces with age as complete presbyopia is approached.

AB - The dynamic accommodation responses to small, abrupt changes in an accommodation stimulus were studied in two experiments. In the first, responses of 19 subjects with ages distributed between 18 and 49 years were measured for step stimuli of ±1.05 D. In the second, responses to small step stimuli (±0.75, ±1.75 D) were recorded for a group of six ‘young’ (mean age 22, range 16–26 years) and six ‘old’ (mean age 42, range 36–48 years) subjects. In both experiments, the low target vergences always lay within the accommodation range of all subjects. Whether the data were analysed in terms of simple reaction and response times, or in terms of the frequency response, no marked systematic changes with age were found in the dynamics of the response in either of the experiments. It is concluded that, for small stimuli within the amplitude of accommodation, the response dynamics over the adult age range studied remain remarkably constant, even though the amplitude progressively reduces with age as complete presbyopia is approached.

KW - accommodation dynamics

KW - vision science

KW - presbyopia

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