On Tue, Jan 4, 2011 at 4:06 PM, Nishant Shah <[email protected]> wrote: > 1. Causa Materialis. Apart from the Aristotlean overtones, it is actually > the chief cause that affects the price range. Normal spherical glass lenses > are dirt cheap. But if you have a higher power, a cylindrical axis or other > such anomaly, then they will be useless and it is time to shell out more > money. If your lenses are fibres, then you need to further look at whether > they are anti-glare, scratch-resistant, dirt-resistant and branded. For each > feature the prices will rise. My younger brother's recently gotten himself a > pair that is shatter-proof, which means that even if you crush them, the > lenses don't shatter and you are not likely to be blinded by an incoming > shard.
This is exactly what bothered me -- other than believing the salesguy, how can you tell whether your new lenses _are_ anti-glare, scratch resistant and what-not? -- b
