Optician Online - CPD Archive
WEBMar 5, 2019 · It is worth mentioning at this stage that BVD calculations must also be considered in the presence of an astigmatic refraction result. Figure 1: Calculation of contact lens power from spectacle prescription. A prescription of -3.75DS/-1.50DC x 180 may not at first glance look like it necessitates a BVD adjustment, however, it …
Optical properties of lens materials - Optician Online
WEBJun 9, 2005 · Crown glass provides poor protection against UVA as its cut-off is only 300nm. Higher-index glasses are better, with cut-off values of 330-350nm. Plastic materials have better UV protection than glass. For an uncoated CR39 lens, the cut off is 350nm, and for higher index lenses the cut off can be around 380nm.
Optician Online - CPD Archive
WEBThe Frame PD. The box centre distance (BCD) is also commonly known as the frame PD and it can be seen from the diagram in figure 1 that: BCD, c = a/2 + d + a/2 = a + d. Alternatively: Frame PD = Eye Size + DBL. The frame PD is an important concept when advising patients on their frame selection.
Optician Online - CPD Archive
WEBFundamentals of ophthalmic dispensing – Part 3: Face, frame and centration measurements relating to custom eyewear. The tendency to take minimal measurements when dispensing is in many ways counterproductive if opticians are to differentiate themselves from their online competitors. It is common to …
Top UK optical chains - Optician Online
WEBMay 25, 2018 · Sean Rai-Roche reports on the current retail climate, with a round-up of the top dozen UK chains. Specsavers. When Doug and Dame Mary Perkins, opened the first Specsavers store in Bristol back in 1984, no one quite predicted just how much of an impact the business would have on the profession. Today, Specsavers is the world’s largest ...
Optician Online - Tom Davies designs frames for Wonka movie
WEBDec 1, 2023 · Eyewear designer Tom Davies has created two bespoke frames for the upcoming Warner Brothers’ Wonka and a further collection of seven frames inspired by the movie. For the character Fickelgruber, Davies created a classic period-appropriate shape with a green tint to the lens, while the character Abacus required vintage frames to sit at the end of the nose.
Opinion - Optician Online
WEBAbout us. Optician magazine is the leading independent, weekly, UK journal for eye care professionals.
How to interpret Optomap retinal images - Optician Online
WEBJul 21, 2006 · The main advantage of the Optomap retinal exam is that it is able to capture a 200º fundus image with or without dilation. The instrument is operator-friendly and only requires a practice assistant to operate it. The 200º imaging (80 per cent of the fundus) allows for detection of most lesions. The ora serrata is 240º and eye steering ...
The law in practice - Optician Online
WEBThe law in practice. 28 April 2005 Optician. Richard Wilshin discusses aspects and questions of practice that frequently arise and cause concern or tend to affect the standard of the profession's service to the public (CET Module: C4685c) The fact that optometrists and dispensing opticians are regulated health professionals is well established ...
Binocular vision: The Mallett fixation disparity test
WEBJul 13, 2006 · The Mallett fixation disparity test is a widely used diagnostic tool within UK optometry. The purpose of this study was to evaluate for the first time the effect of test instructions on the results of this test in a clinical setting. Previous research indicates that the Mallett unit is a useful tool for detecting symptomatic heterophoria at ...