Change in human lens dimensions, lens refractive index distribution and ciliary body ring diameter with accommodation

Adnan Khan, James M. Pope, Pavan K. Verkicharla, Marwan Suheimat, David A. Atchison

Research output: Contribution to journalArticle

5 Citations (Scopus)


We investigated changes in ciliary body ring diameter, lens dimensions and lens refractive index distributions with accommodation in young adults. A 3T clinical magnetic resonance imaging scanner imaged right eyes of 38 18-29 year old participants using a multiple spin echo sequence to determine accommodation-induced changes along lens axial and equatorial directions. Accommodation stimuli were approximately 1 D and 5 D. With accommodation, ciliary body ring diameter, and equatorial lens diameter decreased (-0.43 ± 0.31 mm and -0.30 ± 0.23 mm, respectively), and axial lens thickness increased (+ 0.34 ± 0.16 mm). Lens shape changes cause redistribution of the lens internal structure, leading to change in refractive index distribution profiles. With accommodation, in the axial direction refractive index profiles became flatter in the center and steeper near the periphery of the lens, while in the equatorial direction they became steeper in the center and flatter in the periphery. The results suggest that the anatomical accuracy of lens optical models can be improved by accounting for changes in the refractive index profile during accommodation.

Original languageEnglish
Article number#314771
Pages (from-to)1272-1282
Number of pages11
JournalBiomedical Optics Express
Issue number3
Publication statusPublished - 1 Mar 2018


ASJC Scopus subject areas

  • Biotechnology
  • Atomic and Molecular Physics, and Optics

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