I had an eyetest today as i was not happy with my pevious perscription they perscribed me stronger lenses today, i have had 3 different opions now the 1st and 2nd tests were specsavers the third was vision express three diff perscriptions whats gone wron
by 
bright spark.
ANSWERS: 2
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You dont' say what your condition is so I will just take a guess here. If you are, like me, hypermetropic and astigmatic, this particular eye problem is very hard to nail prescription wise. I have had this problem since I was 6 and have changed glasses too many times to count because my vision changes every 2-3 years or so. When I do the test, even I can't really tell if I can see better with one set of test lenses or another. I can usually only tell if the prescription is right in the long term, meaning having worn my new glasses for several days in my "normal" environment such as work, watching TV, reading. Personally, I feel that sticking to one eye-doctor or optician through the years is the best option has s/he will be familiar with your case history and can make a better judgement each time you need a new prescription. That's just my experience.
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Thats a little worrying, but as alicat says its hard to tell the difference when being tested, i am the same, most of the time i just say 'can't tell' i'm surprised he can make lenses based on my can't tells! but yes i stick to the same, spec savers, and my perscription hardly differs at all :)
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