From the fundamental of the optical aspherical replication technique, relationship among wave error of the emergent
wave surface, the profile accuracy of the substrate and the refractive index difference is discussed. Figure of the
relationship between wave error of the emergent wave surface and the profile accuracy of the substrate under the
condition of three values of the refractive index difference is shown. Theoretical analysis shows that if requirement of the
wave error of the emergent wave surface is not extremely strict and index of the resin is proper, the substrate needn't to
be polished. Profile graph of the replica using unpolished substrate is provided, and it is compared with profile graph of
the mould. Experimental results show that profile of the replica reflects the mould's figure perfectly. The replica's PV
and RMS are respectively 0.167λ and 0.022λ, and they are enough small to meet the profile precision requirement of
normal optical system.
A method of measuring lenses' power using Moire Deflection Technology is described. Starting from the definition of
lenses' power and the principle of MDT, relationship between Moire fringes' tilting angle and the test lenses' power is
deduced. Calculated result shows that lenses' power is linear with the tangent of Moire fringes' tilting angle. The
corresponding calculating formula is given. Images of Moire fringes through a single lens, an aspheric lens and a
progressive addition lens are provided. Measuring results of single lens's power using MDT are presented, and the
relative measuring results using focimeter are given either. Meanwhile, comparison and analysis of the results are
discussed. It shows that measurement of lenses' power using MDT has high precision and it is simple and convenient to
implement. Furthermore, using MDT we can realize a whole measurement of lenses' surfaces, and this is very
meaningful to lenses with their power various on the whole surface such as progressive addition lenses. Therefore, it is
applicable and promising to test ophthalmic lenses using MDT.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.