The first two authors (Yao Ni and Xialin Liu) contributed to this study equally.
Evaluation of corneal changes with accommodation in young and presbyopic populations using Pentacam High Resolution Scheimpflug system
Article first published online: 30 OCT 2012
© 2012 The Authors. Clinical and Experimental Ophthalmology © 2012 Royal Australian and New Zealand College of Ophthalmologists
Clinical & Experimental Ophthalmology
Volume 41, Issue 3, pages 244–250, April 2013
How to Cite
Ni, Y., Liu, X., Lin, Y., Guo, X., Wang, X. and Liu, Y. (2013), Evaluation of corneal changes with accommodation in young and presbyopic populations using Pentacam High Resolution Scheimpflug system. Clinical & Experimental Ophthalmology, 41: 244–250. doi: 10.1111/j.1442-9071.2012.02863.x
Competing/conflicts of interest: No stated conflict of interest.
Funding sources: This study was supported by grant from the Science and Technology Planning Project of Guangdong Province (No. 2010B090400416) to Yizhi Liu; and part supported by grant from National Natural Science Foundation of China (81070747) to Xialin Liu.
- Issue published online: 9 APR 2013
- Article first published online: 30 OCT 2012
- Accepted manuscript online: 7 SEP 2012 06:47AM EST
- Manuscript Accepted: 13 JUL 2012
- Manuscript Received: 2 JAN 2012
- Science and Technology Planning Project of Guangdong Province. Grant Number: 2010B090400416
- National Natural Science Foundation of China. Grant Number: 81070747
- anterior chamber;
To evaluate the changes occurring in the cornea with accommodation in young and presbyopic people.
Twenty-three young and 15 presbyopic emmetropic volunteers.
The Pentacam High Resolution system was used to obtain data on the anterior eye segments of emmetropic volunteers in unaccommodated (with an accommodation stimulus of 0.0 D) and accommodated (with an accommodation stimulus of 5.0 D for the young volunteers and 1.0 D for the presbyopic) states.
Main Outcome Measures
Anterior and posterior corneal axial curvature, corneal volume, corneal aberration, anterior chamber depth and anterior chamber volume were evaluated.
A significant decline in anterior chamber depth and anterior chamber volume was induced by accommodation in both young and presbyopic volunteers. There was a small but statistically significant change in corneal volume within 3.0, 5.0 and 7.0 mm diameters during accommodation in both groups. The changes in the corneal curvature map were significant with accommodation in both groups, although individual variations were found in anterior and posterior corneal axial curvature. Moreover, the decreased higher order aberrations were found in both anterior and entire cornea. In particular, spherical aberration was changed in the young group with 5.0 D accommodation stimulus.
This study showed that accommodation can influence the corneal shape and curvature, and, especially, decreased corneal high-order aberrations. Although the modification in corneal shape was small, it produced variations in higher order aberrations with accommodation that may be beneficial for visual performance in near vision.