Objective straylight assessment of the human eye with a novel device

Stefan Schramm; Patrick Schikowski; Elena Lerm; André Kaeding; Matthias Klemm; Jens Haueisen; Daniel Baumgarten

doi:10.1117/12.2209017

4 March 2016 Objective straylight assessment of the human eye with a novel device

Stefan Schramm, Patrick Schikowski, Elena Lerm, André Kaeding, Matthias Klemm, Jens Haueisen, Daniel Baumgarten

Proceedings Volume 9693, Ophthalmic Technologies XXVI; 96931K (2016) https://doi.org/10.1117/12.2209017
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

Forward scattered light from the anterior segment of the human eye can be measured by Shack-Hartmann (SH) wavefront aberrometers with limited visual angle. We propose a novel Point Spread Function (PSF) reconstruction algorithm based on SH measurements with a novel measurement devise to overcome these limitations. In our optical setup, we use a Digital Mirror Device as variable field stop, which is conventionally a pinhole suppressing scatter and reflections. Images with 21 different stop diameters were captured and from each image the average subaperture image intensity and the average intensity of the pupil were computed. The 21 intensities represent integral values of the PSF which is consequently reconstructed by derivation with respect to the visual angle. A generalized form of the Stiles-Holladay-approximation is fitted to the PSF resulting in a stray light parameter Log(IS). Additionaly the transmission loss of eye is computed. For the proof of principle, a study on 13 healthy young volunteers was carried out. Scatter filters were positioned in front of the volunteer’s eye during C-Quant and scatter measurements to generate straylight emulating scatter in the lens. The straylight parameter is compared to the C-Quant measurement parameter Log(ISC) and scatter density of the filters SDF with a partial correlation. Log(IS) shows significant correlation with the SDF and Log(ISC). The correlation is more prominent between Log(IS) combined with the transmission loss and the SDF and Log(ISC). Our novel measurement and reconstruction technique allow for objective stray light analysis of visual angles up to 4 degrees.

Citation Download Citation

Stefan Schramm, Patrick Schikowski, Elena Lerm, André Kaeding, Matthias Klemm, Jens Haueisen, and Daniel Baumgarten "Objective straylight assessment of the human eye with a novel device", Proc. SPIE 9693, Ophthalmic Technologies XXVI, 96931K (4 March 2016); https://doi.org/10.1117/12.2209017

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Eye

Point spread functions

Beam propagation method

Visualization

Wavefronts

Digital micromirror devices

Light scattering

Show All Keywords

Keywords/Phrases

Search In:

Publication Years