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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 5 — Mar. 1, 2013
  • pp: 745–747

Improving retinal imaging by corneal refractive index matching

N. Meitav, E. N. Ribak, and A. V. Goncharov  »View Author Affiliations

Optics Letters, Vol. 38, Issue 5, pp. 745-747 (2013)

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Imaging the retina at high resolution requires a dilated pupil, which in turn exposes more corneal irregularities. We diminish the optical errors of the cornea by refractive index matching. Lens-fitted goggles were used for corneal immersion, to reduce its aberrations, while keeping the ocular power. An additional aspheric plate reduced the residual ocular spherical aberration. A comparison of the index-matching-based retinal images with those acquired directly shows resolution improvement for subjects with normal extent of ocular aberrations. A simulation of the point spread function, obtained from an averaged ocular and corneal wavefront error, also reveals substantial improvement when using corneal index matching. The demonstrated improvement using index matching may enable further improvement of current retinal imaging techniques or relaxing requirements for active ocular aberration correction.

© 2013 Optical Society of America

OCIS Codes
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices
(330.6130) Vision, color, and visual optics : Spatial resolution
(330.7338) Vision, color, and visual optics : Visually coupled optical systems

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: January 3, 2013
Revised Manuscript: January 29, 2013
Manuscript Accepted: January 29, 2013
Published: February 26, 2013

Virtual Issues
Vol. 8, Iss. 4 Virtual Journal for Biomedical Optics

N. Meitav, E. N. Ribak, and A. V. Goncharov, "Improving retinal imaging by corneal refractive index matching," Opt. Lett. 38, 745-747 (2013)

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