Hi Rob,
I agree with everything powrwrap and Chuck Knight have said, and have
three additional suggestions:

1. Choose a memory titanium frame that will withstand your toddler,
and return to its original shape and alignment.  If the kid pulls the
glasses off by one stem, it will flex, and be less likely to crack the
lens.

2. Choose a frame that has double-drilled anchors on the lenses (e.g.
Zenni 3773 or 39dollarglasses.com Bendable Titanium Rimless 1). This
is the big stress-point.

3. Consider a 50mm lens width, instead of 53 or more. This will result
in significantly thinner edges.

In your prescription, polycarbonate should work just fine.  Hi-index
would probably be overkill and a waste of money. It's mainly for
people like me, with a -9.00 prescription.  See my photo on Flickr.

http://www.flickr.com/photos/43512...@n03/4008561067/in/pool-glassyeyes

There's no pretending with my prescription . . . it's thick, but the
glasses look cool anyway, and I get a lot of compliments on them.
They are a year old, and have held up extremely well.

Good luck!

Eric

On Oct 12, 6:28 pm, "Rob O." <[email protected]> wrote:
> I'm about to venture in to this uncharted (for me) territory of
> purchasing eyeglasses online.  I'm tempted to try a pair of rimless -
> which would also be a first for me - but a little nervous about the
> edge thickness of the lens.
>
> In my current glasses which came from a brick & mortar shop, the left
> lens (-2.50 spherical, -1.50 cylindrical, & 160 axis) is about 53mm
> wide & 27mm  tall.  At its outer-most edge, the lens is 6mm thick.  I
> have no idea what the lens index is specifically, although I recall at
> the time of purchase, that I had to pay a bit extra and wait a couple
> of days for "High Index" lens.
>
> I'm comfortable with a comparable lens width (+/- a couple of mms) but
> I worry that in a rimless style, that's 6mm outer edge would look
> kinda bad.  So, would stepping up to a more expensive 1.591 or 1.60
> High Index lens keep that outer edge thickness down a bit?  And aside
> from the cost, is there a downside to using a higher index lens - do
> you forgo some material strength or scratch-resistance when you get
> into those higher index options?  I read something that implied that
> higher index lens might be less optically-correct than standard index
> lens - any truth to that?
>
> (I've never had half-rimless glasses either, so I guess the same
> question kinda applies for those, since I would imagine that the
> bottom left edge of the lens is going to be fairly obvious with a half-
> rim design - although maybe not quite as jarring as it'd be with a
> fully-rimless lens.)
>
> And finally & more generally, I'm a new Dad and my glasses are taking
> a bit more incidental abuse from my rough & tumble toddler.  With that
> in mind, am I just crazy for even considering rimless?  Would a hinge-
> less design be better or worse for enduring minor bumps?

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