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Dynamics of accommodative facility in myopes.
Invest Ophthalmol Vis Sci. 2007 Sep; 48(9):4375-82.IO

Abstract

PURPOSE

To evaluate the dynamic changes in refraction during the accommodative facility test in myopes and emmetropes.

METHODS

Ten myopes and 10 emmetropes participated in the study. All were young adults, and refractive error in the myopes was corrected with soft contact lenses. Monocular accommodative facility measurements were taken for a 40-cm and a 6-m working distance with +2.00/-2.00-D and Plano/-2.00-D flippers, respectively. Subjective facility was recorded with automated flippers and objective measurements of dynamic accommodation response were simultaneously taken with a photorefractor.

RESULTS

Subjective and objective facility measurements showed a significantly lower facility rate in myopes when compared with emmetropes at distance (P < 0.05) but not at near (P > 0.05). The response amplitude of accommodation during facility tasks was found to be similar in the two refractive groups. However, the velocity of accommodation was found to be lower in myopes than in emmetropes for distance facility (P < 0.05) but not for near facility (P > 0.05). Velocity of disaccommodation was lower in myopes than in emmetropes at both distance and near (P < 0.05).

CONCLUSIONS

During distance accommodative facility testing, myopes exhibited a lower velocity of accommodation and disaccommodation, which led to a lower distance accommodative facility rate. For near facility measurements, however, although velocity of disaccommodation was lower in myopes, velocity of accommodation was found to be similar in the two refractive groups. A variety of factors that contribute to these differences are discussed.

Authors+Show Affiliations

Faculty of Life Sciences, The University of Manchester, Manchester, United Kingdom. hema.radhakrishnan@manchester.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17724230

Citation

Radhakrishnan, Hema, et al. "Dynamics of Accommodative Facility in Myopes." Investigative Ophthalmology & Visual Science, vol. 48, no. 9, 2007, pp. 4375-82.
Radhakrishnan H, Allen PM, Charman WN. Dynamics of accommodative facility in myopes. Invest Ophthalmol Vis Sci. 2007;48(9):4375-82.
Radhakrishnan, H., Allen, P. M., & Charman, W. N. (2007). Dynamics of accommodative facility in myopes. Investigative Ophthalmology & Visual Science, 48(9), 4375-82.
Radhakrishnan H, Allen PM, Charman WN. Dynamics of Accommodative Facility in Myopes. Invest Ophthalmol Vis Sci. 2007;48(9):4375-82. PubMed PMID: 17724230.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dynamics of accommodative facility in myopes. AU - Radhakrishnan,Hema, AU - Allen,Peter M, AU - Charman,W Neil, PY - 2007/8/29/pubmed PY - 2007/10/12/medline PY - 2007/8/29/entrez SP - 4375 EP - 82 JF - Investigative ophthalmology & visual science JO - Invest. Ophthalmol. Vis. Sci. VL - 48 IS - 9 N2 - PURPOSE: To evaluate the dynamic changes in refraction during the accommodative facility test in myopes and emmetropes. METHODS: Ten myopes and 10 emmetropes participated in the study. All were young adults, and refractive error in the myopes was corrected with soft contact lenses. Monocular accommodative facility measurements were taken for a 40-cm and a 6-m working distance with +2.00/-2.00-D and Plano/-2.00-D flippers, respectively. Subjective facility was recorded with automated flippers and objective measurements of dynamic accommodation response were simultaneously taken with a photorefractor. RESULTS: Subjective and objective facility measurements showed a significantly lower facility rate in myopes when compared with emmetropes at distance (P < 0.05) but not at near (P > 0.05). The response amplitude of accommodation during facility tasks was found to be similar in the two refractive groups. However, the velocity of accommodation was found to be lower in myopes than in emmetropes for distance facility (P < 0.05) but not for near facility (P > 0.05). Velocity of disaccommodation was lower in myopes than in emmetropes at both distance and near (P < 0.05). CONCLUSIONS: During distance accommodative facility testing, myopes exhibited a lower velocity of accommodation and disaccommodation, which led to a lower distance accommodative facility rate. For near facility measurements, however, although velocity of disaccommodation was lower in myopes, velocity of accommodation was found to be similar in the two refractive groups. A variety of factors that contribute to these differences are discussed. SN - 0146-0404 UR - https://www.unboundmedicine.com/medline/citation/17724230/Dynamics_of_accommodative_facility_in_myopes_ L2 - http://iovs.arvojournals.org/article.aspx?doi=10.1167/iovs.07-0269 DB - PRIME DP - Unbound Medicine ER -