I would choose 0star if I could. Do not use this company unless you are planning to go blind. I went there as I notice sudden vision changes in my left eye and they used their iScan top of the world £400 Million technology machine on my eye and they said my eye is healthy and nothing is wrong with it apart from my sight was going bad and I need a glasses. Which is far from true I was suffering from detaching retina which would made me go blind. Good that I had common sense and followed my gut feeling that this didn’t sound right, your eyesight doesn’t deteriorate suddenly it takes time. So, I took my self to Moorfiled hospital and guess what I was on the surgery the next morning and they managed to save my sight. I contact optical express after my surgery to make them aware that they misdiagnosed me and that they should investigate this to avoid this happening to others. After 11.5 weeks and chasing them they finally told me that they are not going to do anything about this. I am not the one to write these types of review, but my ethic won’t allow me to let this go either. So, If I were you I would think twice contacting optical express.