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WEBOptician enables subscribers to complete all their CPD points in all competencies – without leaving the practice.
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
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 …
Optician Online - CPD Archive
WEBThis might lead to the conclusion that the corridor length is 22mm, however corridor length is defined in BS EN ISO 13666:2012 as the distance between y10 and y90, the points on the lens where 10% and 90% of the reading addition are realised respectively. In this fictitious lens, the corridor length, L, shown in figure 5 is approximately 14mm.
CPD - Optician Online
WEBPost-operative complications of cataract surgery. Christian Dutton, Simon Hardman-Lea, Kin Tam, Jasraj Bhangra and Jo-Sheetal Thethy summarise the pathophysiology and management of cataract post-operative complications as identified by the National Ophthalmology Database Audit 2023. Closing date: 29 May Optometrists.
CPD Archive - Optician Online
WEBWhat causes rechecks and how to avoid them. Our recent study investigating non-tolerance to new spectacles 1 found that 2.3% of eye examinations resulted in a recheck, similar to the pooled prevalence of older studies of 2.1%. 2 With approximately 22.5 million UK yearly eye exams, 3 these figures correspond to 0.5 million rechecks conducted in ...
CPD Archive - Optician Online
WEBA 28mm curved top or flat top bifocal is a good general-purpose choice for a first-time user with the C28 having the edge in terms of adaptability, cosmesis and jump. Professional drivers may prefer a smaller C25 or D25 seg to facilitate peripheral distance vision when using door mirrors or reversing.
Optician Online - CPD Archive
WEBAssessing the anterior chamber (AC) is an essential part of evaluating the risk of glaucoma. 1,7 Glaucoma is an eye disease characterised by a progressive optic neuropathy and associated visual field loss. 4 In the UK it is the second leading cause of vision loss after AMD. Early detection is more likely to lead to a better prognosis 14 yet it is thought that 50% living with the disease are ...
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.
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