English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Progressive addition lenses (PAL) are meant to provide clear and comfortable vision to wearer at every given distance. But it is increasingly becoming common to hear PAL wearers expressing one form of misgiving or the other over their effectiveness. This Lagos based study of 106 PAL wearers revealed that most of the problems associated with the use of PAL have to do with precision in mounting lenses to specification using appropriate data: Interpupillary Distance (IPD); Segment Height (SH); Optic Centre of Lenses (OC); Geometric Centre of Frame(Mid-Datum Depth). 15subjects (14.2% of study population) have discomfort with use of PALdue to wrong placement of segment height, while 8 subjects (7.5%) have difficulty using PAL due to inaccurate application of IPD resulting in decentration with concomitant prismatic effect. Statistical analysis of data using Chi Square revealed that the various complaints about use of PAL had no relationship with age of wearer. This study underscored urgent need for the establishment of formal training school for practicing dispending opticians in Nigeria.

Survey on problems associated with the use of progressive addition lenses (pal)