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Nuclear cataract and myopic shift in refraction.
Am J Ophthalmol 2007; 144(3):457-9AJ

Abstract

PURPOSE

Nuclear cataract is thought to cause a myopic shift in refraction in older persons. The authors tested this hypothesis by assessing the correlation of nuclear opacity with spherical equivalent refraction (SER) in an older population.

DESIGN

Population-based cross-sectional study.

METHODS

Three thousand six hundred and fifty-four participants aged 49 years or older were examined in the Blue Mountains Eye Study [BMES] (1992 to 1994). Eye examinations included subjective refraction and lens photographs. Nuclear opacity was assessed against four standard slit-lamp lens photographs using the Wisconsin Cataract Grading System. Nuclear cataract was defined as opacity level 4 or higher.

RESULTS

Participants without nuclear cataract had an annual mean hyperopic shift of 0.05 diopters (P < .0001). In persons with nuclear cataract, this hyperopic shift disappeared. A myopic refractive shift occurred only in persons with nuclear opacity levels of 4 or higher.

CONCLUSION

This study documents the contribution of nuclear cataract to the mild myopic shift that neutralizes the age-related hyperopic shift occurring in older persons.

Authors+Show Affiliations

Centre for Vision Research, Department of Ophthalmology, Westmead Millennium Institute, University of Sydney, Sydney, Australia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17765431

Citation

Samarawickrama, Chameen, et al. "Nuclear Cataract and Myopic Shift in Refraction." American Journal of Ophthalmology, vol. 144, no. 3, 2007, pp. 457-9.
Samarawickrama C, Wang JJ, Burlutsky G, et al. Nuclear cataract and myopic shift in refraction. Am J Ophthalmol. 2007;144(3):457-9.
Samarawickrama, C., Wang, J. J., Burlutsky, G., Tan, A. G., & Mitchell, P. (2007). Nuclear cataract and myopic shift in refraction. American Journal of Ophthalmology, 144(3), pp. 457-9.
Samarawickrama C, et al. Nuclear Cataract and Myopic Shift in Refraction. Am J Ophthalmol. 2007;144(3):457-9. PubMed PMID: 17765431.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Nuclear cataract and myopic shift in refraction. AU - Samarawickrama,Chameen, AU - Wang,Jie Jin, AU - Burlutsky,George, AU - Tan,Ava G, AU - Mitchell,Paul, PY - 2007/03/30/received PY - 2007/05/03/revised PY - 2007/05/03/accepted PY - 2007/9/4/pubmed PY - 2007/9/25/medline PY - 2007/9/4/entrez SP - 457 EP - 9 JF - American journal of ophthalmology JO - Am. J. Ophthalmol. VL - 144 IS - 3 N2 - PURPOSE: Nuclear cataract is thought to cause a myopic shift in refraction in older persons. The authors tested this hypothesis by assessing the correlation of nuclear opacity with spherical equivalent refraction (SER) in an older population. DESIGN: Population-based cross-sectional study. METHODS: Three thousand six hundred and fifty-four participants aged 49 years or older were examined in the Blue Mountains Eye Study [BMES] (1992 to 1994). Eye examinations included subjective refraction and lens photographs. Nuclear opacity was assessed against four standard slit-lamp lens photographs using the Wisconsin Cataract Grading System. Nuclear cataract was defined as opacity level 4 or higher. RESULTS: Participants without nuclear cataract had an annual mean hyperopic shift of 0.05 diopters (P < .0001). In persons with nuclear cataract, this hyperopic shift disappeared. A myopic refractive shift occurred only in persons with nuclear opacity levels of 4 or higher. CONCLUSION: This study documents the contribution of nuclear cataract to the mild myopic shift that neutralizes the age-related hyperopic shift occurring in older persons. SN - 0002-9394 UR - https://www.unboundmedicine.com/medline/citation/17765431/full_citation L2 - https://linkinghub.elsevier.com/retrieve/pii/S0002-9394(07)00435-7 DB - PRIME DP - Unbound Medicine ER -