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Characteristics of pupil responses during far-to-near and near-to-far accommodation.
Ophthalmic Physiol Opt. 2005 Jul; 25(4):328-39.OP

Abstract

The static and dynamic aspects of the pupil response associated with various amplitudes of far-to-near (accommodation) and near-to-far (disaccommodation) focusing responses were evaluated in this study. Dynamic refractive and pupillary changes were measured simultaneously during focusing responses to targets at real distances in 12 young (23-26 years) emmetropic subjects. The targets were presented alternately at far (6 m) and at one of six near positions from 1 D (1 m) to 6 D (16.7 cm) in 1 D steps. The latency, magnitude and peak velocity of pupil changes associated with accommodation and disaccommodation responses were calculated. The latency of refractive changes was shorter than that of pupillary changes. In general, the pupil constricted with accommodation and started dilating while accommodation was still maintained, resulting in reduced pupil dilation with disaccommodation. The magnitude of the pupil response increased linearly with that of accommodation and disaccommodation. The amount of pupil change per dioptre of refractive change was invariant with various amplitudes of refractive change. The peak velocity of pupil constriction was greater than that of pupil dilation for corresponding amplitudes. The pupil response is more closely associated with accommodation than with disaccommodation.

Authors+Show Affiliations

College of Optometry, University of Houston, Houston, TX 77204, USA.No affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

15953118

Citation

Kasthurirangan, Sanjeev, and Adrian Glasser. "Characteristics of Pupil Responses During Far-to-near and Near-to-far Accommodation." Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists), vol. 25, no. 4, 2005, pp. 328-39.
Kasthurirangan S, Glasser A. Characteristics of pupil responses during far-to-near and near-to-far accommodation. Ophthalmic Physiol Opt. 2005;25(4):328-39.
Kasthurirangan, S., & Glasser, A. (2005). Characteristics of pupil responses during far-to-near and near-to-far accommodation. Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists), 25(4), 328-39.
Kasthurirangan S, Glasser A. Characteristics of Pupil Responses During Far-to-near and Near-to-far Accommodation. Ophthalmic Physiol Opt. 2005;25(4):328-39. PubMed PMID: 15953118.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characteristics of pupil responses during far-to-near and near-to-far accommodation. AU - Kasthurirangan,Sanjeev, AU - Glasser,Adrian, PY - 2005/6/15/pubmed PY - 2005/9/24/medline PY - 2005/6/15/entrez SP - 328 EP - 39 JF - Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) JO - Ophthalmic Physiol Opt VL - 25 IS - 4 N2 - The static and dynamic aspects of the pupil response associated with various amplitudes of far-to-near (accommodation) and near-to-far (disaccommodation) focusing responses were evaluated in this study. Dynamic refractive and pupillary changes were measured simultaneously during focusing responses to targets at real distances in 12 young (23-26 years) emmetropic subjects. The targets were presented alternately at far (6 m) and at one of six near positions from 1 D (1 m) to 6 D (16.7 cm) in 1 D steps. The latency, magnitude and peak velocity of pupil changes associated with accommodation and disaccommodation responses were calculated. The latency of refractive changes was shorter than that of pupillary changes. In general, the pupil constricted with accommodation and started dilating while accommodation was still maintained, resulting in reduced pupil dilation with disaccommodation. The magnitude of the pupil response increased linearly with that of accommodation and disaccommodation. The amount of pupil change per dioptre of refractive change was invariant with various amplitudes of refractive change. The peak velocity of pupil constriction was greater than that of pupil dilation for corresponding amplitudes. The pupil response is more closely associated with accommodation than with disaccommodation. SN - 0275-5408 UR - https://www.unboundmedicine.com/medline/citation/15953118/Characteristics_of_pupil_responses_during_far_to_near_and_near_to_far_accommodation_ L2 - https://doi.org/10.1111/j.1475-1313.2005.00293.x DB - PRIME DP - Unbound Medicine ER -