Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Acquisition of the curves of the human crystalline lens from slit lamp images: an application of the Hough transform

Not Accessible

Your library or personal account may give you access

Abstract

To accurately model lens-based functions such as accommodation and image formation on the retina, it is essential to know anterior chamber depth, anterior segment length, lens thickness, and, most importantly, lens curvature both on the surfaces and internally. With the exception of lens curvatures, all these data can be obtained with a high degree of precision by one or more techniques (i.e., A-scan ultrasonography and pachymetry). Lens curvatures can be collected by Scheimpflug slit lamp photography, but the curvature data must be extracted from these images, a problem complicated by both linear and nonlinear image distortion. Previous approaches have involved significant magnification of the image combined with major subjective input and judgment. We present here a computer-based application of the Hough technique for measurement of curvature of lens surfaces observed in Scheimpflug slit lamp photography and related evaluation of (and solutions for) the associated image distortion. Minimal user input is required for successful application of this method, but the time required to obtain a fit for each surface is >1 min. Results obtained by this technique on test images compare favorably with those obtained by independent methods.

© 1991 Optical Society of America

Full Article  |  PDF Article
More Like This
Aging of the human lens: changes in lens shape at zero-diopter accommodation

Jane F. Koretz, Christopher A. Cook, and Paul L. Kaufman
J. Opt. Soc. Am. A 18(2) 265-272 (2001)

Scheimpflug and high-resolution magnetic resonance imaging of the anterior segment: a comparative study

Jane F. Koretz, Susan A. Strenk, Lawrence M. Strenk, and John L. Semmlow
J. Opt. Soc. Am. A 21(3) 346-354 (2004)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (6)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved