Page 150 - The Indian Optician Digital Edition Jan-Feb 2020

PROGRESSIVE

POWER LENSES

– PART ELEVEN

Mo Jalie, SMSA, FBDO (Hons), Hon FCGI Hon FCOptom, MCMI, is a Visiting
Professor of Optometry at the University of Ulster in Coleraine, and at the
post-graduate facility at Varilux University. He served for nine years as Head
of Department of Applied Optics at City & Islington College, where he taught
optics, ophthalmic lenses and dispensing. He is a recognised international
authority on spectacle lens design and has written several books including
Principles of Ophthalmic Lenses. His most recent book, Ophthalmic Lenses
& Dispensing was translated into Russian. He has authored over 200 papers
on ophthalmic, contact and intra-ocular lenses, and on dispensing; and is
a consultant editor to The Optician (UK) and technical editor to The Indian
Optician journal. He holds patents for aspheric spectacle and intra-ocular
lenses. Jalie is a past-chairman of the Academic Committee of the Association
of British Dispensing Opticians, and was the first Chairman of the Faculty of
Dispensing Opticians. He is the ABDO representative on the BSI committees on
ophthalmic lenses and spectacle frames and a past member of the Education
Committee of the General Optical Council. In 1998 Jalie was thrice honoured:
he was made Honorary Fellow of the British College of Optometrists, a Life
Fellow of the Association of British Dispensing Opticians, and in December of
that year he was granted the Max Wiseman Memorial Research Medal.
Prof Mo Jalie

atents have been taken out
in recent years by several
Pmajor lens manufacturers
disclosing progressive designs of
unusual configuration. Some simply
embody improvements in the design
and manufacture of the lenses. For
example, US Patent 8550622:2013
1
assigned to Hoya Lens Manufacturing
in the Phillipines, which allows for
input of the intermediate centration FIGURE 1 - HORIZONTAL SECTIONS TO
distance (CD) for a given working SHOW PROGRESSIVE ADDITION OF
distance, obtained either by means of HORIZONTAL PRISM IN THE LOWER
PORTION OF A PPL
optometric instrumentation such as
the Nidek Accommodator AA-2000, of the lens and it is these which are
or the Grand Seiko Autorefractor the distance CD and the intermediate described in more detail in this part of
GR-2100/GR-3100K. In the absence working distance. the series. Some of these designs are
of such instrumentation it is not yet in production but may appear
suggested that the intermediate CD Other recent patents disclose in the near future if there is a demand
be calculated from a knowledge of novel features relating to the purpose from the marketplace.

| JAN-FEB 2020 | 146 LENS TALK

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