Matt

This is an interesting and practical issue. We recently returned
eyewear (2 pairs both with plastic lenses) that had developed numerous
cracks within 18 months or so. At no time were they dropped or
mis-handled and they were cleaned in accordance with the manufacturer's
instructions. I now see that our new eyewear is developing small cracks
after only a few months. I am wondering if the material is stressed
during the manufacturing process. Perhaps there is someone out there who
can enlighten us about the manufacturing of eyewear?

Re-certification would not be worthwhile as it is very expensive.

Regards
Harry


Harry Moseley

Hon. Reader
Consultant Medical Physicist
The Photobiology Unit
University of Dundee
Ninewells Hospital & Medical School
Dundee
DD1 9SY
United Kingdom

Tel: (0)1382 633894
Fax: (0)1382 646047


>>> [log in to unmask] 4/11/2006 4:51:27 PM >>>
during an HSE inpsection today
one (of the few) question was raised about renewal intervals for Laser
safety eye-wear.

Obvious damage etc renders end of life.

Any members/ manufacturers/ suppliers experience of replacement
interval

is each manufacturer different, 
Do some products last better than others, eg stability of filter
system, glass vs plastic etc

Or would it be prudent to have eye wear re-certificated at intervals

Matt

Matt Williamson
Laser Protection Advisor
Medical Physics
Leeds General Infirmary
tel 01924 212900
mobile 07768 987956
[log in to unmask] 



Matt Williamson
Consultant Clinical Scientist
Head of Clinical Physics
Pinderfields General Hospital
Wakefield
tel 01924 212900
pager 07699 648631
mobile 07768 987956
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