Fringes using soft contact lens

I have had a soft contact lens fitted for my right eye by two different practioners. The prescription is -12.  Both times, I see 'fringes' above and below images and print.   This fluctuates before and after blinking, but then returns.  The practitioner thinks it might be the effect of an early cataract, but I don't get this effect wearing spectales.   I could have the cataract removed, but wanted to try a contact lens first, and to try mini-monovision.   I asked about a hard contact lens but was told it would be very expensive.  (I have negligible astigmatism - about 0.5. 

I use contacts and would recommend you this brand's, aaany problems with them, no no no, absolutely and even feel they cure my sight, superb stuff

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Thank you. Please could you send the brand name via the private message service ?    I understand though that few companies who supply ot the UK manufacture lenses of -11 diopters or stronger.