Research Subject

[da]

On Tuesday, I went for my 2nd of five visits to the optometrist as part of a research project on eyestrain. They gave me my new glasses, which initially made me a bit... alarmed... because the effect of turning my head was a bit like... that Hitchcock depth-of-field movie effect? You know the one I mean? Anyway, they did funky things to these glasses. I think it's a bit like progressive-lens bifocals, or maybe they're n-focals since it also does something odd side-to-side.

The research student tells me my eyes will figure out where to focus for close-up and distance work, which is slightly worrying, but the fact that I'm essentially adjusted to them this morning is at least promising.

Comments

[dcseain.livejournal.com]

I had one pair of 'progressive bifocals' in which i could pick out 7 different viewing regions. A well-designed progressive lens has an optically infinite number of zones which are a straight line in the vertical centre of the lens, with each zone above and below that point being more bell-curve shaped, within the limits of lens shape.

They all come together in the horizontal centre of the lens, at each side. You should notice less distortion that way if you look up or down to the side through the lens.

Though, lens tech has come a long way. I have curved-lens sunglasses, the wrap toward my temples, which have my full astigmatism/presbyobia bifocal in them. Oddly, there's no distortion in the peripheral vision zones of the lens.