To provide more info, I read this article on the Guardian and became very worried:
"The multibillion-pound corrective eye surgery industry has been thrust into the spotlight as regulators announced they were investigating claims that a new artificial lens implanted into the eyes of thousands of patients had caused serious loss of vision.
Officials have launched their inquiry after a number of concerned surgeons submitted testimony that patients had complained of defective vision, with some, according to one doctor, struggling to see clearly beyond the outstretched length of their arms.
Around 120,000 people seeking a life without glasses undergo corrective eye surgery every year either by laser or, often in the case of the over-50s, through the replacement of their natural lenses through surgery.
It is believed that over the last year many thousands were fitted with the Mplus X lens in a boom time for the industry fuelled by marketing and the promise of interest-free credit on bills, which can be in excess of £3,000 an eye.
The lens in question, manufactured by German company Oculentis and introduced into the UK last January, was supposed to offer an improved performance on previous models.
The Observer has learned, however, that Moorfields Eye Hospital NHS Trust, the largest ophthalmic centre in Europe, submitted an official report about the lens after four of its six patients who had had the implant reported a worrying loss of quality of vision."
www.theguardian.com/society/2015/jan/03/top-eye-clinic-faces-claims