In:
Journal of Pediatric Ophthalmology & Strabismus, SLACK, Inc., Vol. 48, No. 1 ( 2011-01), p. 50-56
Abstract:
〈 div class="ftSection" 〉 〈 span class="ftInlineSubsectionTitle" 〉 Purpose: 〈 /span 〉 〈 p 〉 To evaluate whether accommodation has effects on eye elongation. 〈 /p 〉 〈 /div 〉 〈 div class="ftSection" 〉 〈 span class="ftInlineSubsectionTitle" 〉 Methods: 〈 /span 〉 〈 p 〉 Two hundred seventy-three eyes with a refractive error between +1.0 and −0.5 diopters were divided into three groups: pre-school children, grade-school children, and middle-school children. Ocular structures were measured using autorefraction and A-scan ultrasonography. 〈 /p 〉 〈 /div 〉 〈 div class="ftSection" 〉 〈 span class="ftInlineSubsectionTitle" 〉 Results: 〈 /span 〉 〈 p 〉 There was a negative correlation between age and corneal power (r = −0.227, 〈 italic 〉 P 〈 /italic 〉 = .0001), lens thickness (r = −0.263, 〈 italic 〉 P 〈 /italic 〉 = .00001), and Gullstrand lens power (r = −0.452, 〈 italic 〉 P 〈 /italic 〉 & lt; & lt; .0001). There was a positive correlation between age and axial length (r = −0.432, 〈 italic 〉 P 〈 /italic 〉 & lt; & lt; .0001) and vitreous chamber depth (r = 0.505, 〈 italic 〉 P 〈 /italic 〉 & lt; & lt; .0001). Mean corneal power ( 〈 italic 〉 P 〈 /italic 〉 & lt; .001) and lens power ( 〈 italic 〉 P 〈 /italic 〉 & lt; .001) were significantly greater in pre-school children than in grade-school children, whereas axial length ( 〈 italic 〉 P 〈 /italic 〉 & lt; .001) and vitreous chamber depth ( 〈 italic 〉 P 〈 /italic 〉 & lt; .001) were greater in grade-school children. Mean lens thickness ( 〈 italic 〉 P 〈 /italic 〉 = .01) and lens power ( 〈 italic 〉 P 〈 /italic 〉 = .07) were higher in grade-school children than in middle-school children, whereas axial length ( 〈 italic 〉 P 〈 /italic 〉 = .024) and vitreous chamber depth ( 〈 italic 〉 P 〈 /italic 〉 & lt; .001) were higher in middle-school children. 〈 /p 〉 〈 /div 〉 〈 div class="ftSection" 〉 〈 span class="ftInlineSubsectionTitle" 〉 Conclusion: 〈 /span 〉 〈 p 〉 Ocular structures may play different roles in maintaining emmetropia. Accommodation during near work and its potential attendant hyperopic defocus could potentially drive eye elongation. 〈 /p 〉 〈 /div 〉
Type of Medium:
Online Resource
ISSN:
0191-3913
,
1938-2405
DOI:
10.3928/01913913-20100420-06
Language:
English
Publisher:
SLACK, Inc.
Publication Date:
2011
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