When I first started serious birding I switched to contact lenses to
improve my experience - and for several years it worked fine, until I
developed some reaction to the lenses and had to go back to glasses. I
agree that - especially if you have astigmatism - contacts can be
erratic.
The other problem with glasses I find is rain!
Seems you are not adjusting your lens settings correctly. The
technique is to see which lens has the diopter setting. If it is the
right one then close your right eye and focus on a distant object.
Then close left eye (and open right one) and refocus using ONLY the
diopter setting. This should then be fine in all conditions (until it
gets knocked!)
On 10/10/2007, Peter Shute <> wrote:
> Does anyone here use contact lenses for birding? I'm interested in your
> comments about them.
>
> I wear glasses for short-sightedness. My binoculars have enough relief
> to work with them, but it's still a pain for various reasons, including
> glare coming in the sides, eyepieces never being in exactly the same
> place in relation to my eyes, etc.
>
> I also find that my off axis vision (not peripheral) is blurred enough
> to make identification of birds flying from the side difficult until I
> can turn my head towards them - often too late. This is because I'm
> looking through the edges of my glasses, where such simple lenses have a
> slightly different strength.
>
> So I'm trialling contact lenses. My initial observations:
> - Without binoculars, they're far superior to glasses, but erratic. A
> blink can mean slightly blurry vision till the next blink. Off axis
> vision is as good as on axis vision, and I'm much better at identifying
> fast flying birds, and at spotting birds that aren't in front of me.
> - With binoculars, the glare and inconsistent eyepiece placement is
> eliminated, but I'm finding the image quality erratic. I can't put my
> finger on what's wrong. I think at times I can see more clearly, but at
> other times I'm searching for perfect focus and not finding it. I keep
> fiddling with diopter settings, then setting it back how it was again.
> Shutting one eye to set the diopter setting is pointless, as that upsets
> the lens in that eye for when I change eyes - I've taken to doing it by
> putting one hand over the objective instead. And do you think the birds
> wait around while I do this?
>
> Is this how it is for other contact lens wearers? If so, I'm not sure
> that I'll persist with them, despite the advantages.
>
> Perhaps I'm seeking a level of visual acuity that's not obtainable. My
> optometrist says I have better than 20/20 vision with my glasses, and
> much better than what's legally required for driving.
>
> Peter Shute
> www.birding-aus.org
> birding-aus.blogspot.com
>
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