Multimodal characterization of contact lenses

Michael A. Marcus; David Compertore; Donald S. Gibson; Matthew E. Herbrand; Filipp V. Ignatovich

doi:10.1117/12.2196303

12 October 2015 Multimodal characterization of contact lenses

Michael A. Marcus, David Compertore, Donald S. Gibson, Matthew E. Herbrand, Filipp V. Ignatovich

Proceedings Volume 9633, Optifab 2015; 96331W (2015) https://doi.org/10.1117/12.2196303
Event: SPIE Optifab, 2015, Rochester, New York, United States

Abstract

A table top instrument has been designed, constructed and tested to characterize all of the primary optical and physical properties of contact lenses. Measured optical properties include base power, cylinder power, cylindrical axis, prism, refractive index and wavefront aberrations. Measured physical properties include center thickness, lens diameter and lens sagittal depth. The instrument combines a Shack-Hartmann wavefront sensor (SHWS), a machine vision sensor, and a low coherence light interferometer (LCI) all coaxially aligned into a single tabletop unit. The unit includes a cuvette, mounted in a translatable sample chamber for holding the contact lens under test, and it can be configured to measure wet or dry contact lenses. During operation, the vision sensor measures the diameter of the lens, and locates the center of the lens. The lens is then aligned for other measurements. The vision sensor can also measure various alignment marks on the lens, as well as identify any alpha numerical features, which can be used to associate the lens orientation with the measured aberrations. The LCI measures the center thickness, sagittal depth and index of refraction of the contact lens. The base radius of curvature is then calculated using these measured parameters. The SHWS measures the lenses prescription power, including spherical, cylinder, prism, and higher order wavefront aberrations. NIST traceable calibration artifacts are used to calibrate the SHWS, machine vision and LCI modalities. Repeatability measurements on a contact lens in a saline solution are presented.

Citation Download Citation

Michael A. Marcus, David Compertore, Donald S. Gibson, Matthew E. Herbrand, and Filipp V. Ignatovich "Multimodal characterization of contact lenses", Proc. SPIE 9633, Optifab 2015, 96331W (12 October 2015); https://doi.org/10.1117/12.2196303

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
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Contact lenses

Cameras

Wavefront sensors

Refraction

Interferometers

Collimation

Refractive index

Show All Keywords

Keywords/Phrases

Search In:

Publication Years