I am using spectacles of crizal for more than 1 year for head ache, I got severe headache and I visited doctor and took the speds of crizal and the speds worked nicely and the glass is dust proof and water resistant and it has almost fallen 3 times and no scratches appeared in the glass. The glass is very clear and it is very easy to clean and use.
Before using the crizal lens I used another company product which is not much helpful in curing my headache, so I changed to this and it is very good and by wearing it daily 2 to 4 hours the headache is in control and I use it when ever watching TV and system and bright things which is much helpful. They are high in cost and the warranty is given to the speeds in case it is broken they will replace.thanks