http://www.greatcontactlens.net/buy-cheap-contact-lens/
How much does diameter affect contact lens size?
I'm trying to buy contacts cheaper online here because the price of buying them from my doctor is getting crazy. The size where it says diamater is 14.2, while the ones online are only available in 14.5, but all the other measurments and prescriptions add up. Will this be a big problem or could I still wear them?
The doctor wrote you a prescription for a specific diameter because it does matter what the diameter is. If you change the diameter by increasing it and having the other parameters like base curve the same, you are actually changing the fit of the lens. Increasing diameter will create a looser fitting lens and this could cause issues with the fit causing discomfort and problems with visual acuity. An improper fitting lens can actually cause damage to your cornea, even though everything "feels" fine.
This is why contact lenses need to be fit and monitored by an eye doctor. The prescription your eye doctor wrote was for the exact same contact lenses you were fit with.
Online contact lens dealers will actually verify the prescription with your eye doctor... so even if you did get away with ordering contact lenses with a different diameter you would probably be wasting your money, because it is likely they will not fit properly.
If you want to order contact lenses online then you will need to find the exact same contact lenses your prescription was written for.
Hope this helps a bit 
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