Refraction of Image seen by others

[Kevin]

I've notice that when I look at someone wearing glasses the image I
see through their lens is shifted, (i.e. their cheek is shifted
horizontally). Do some lenses shift the image more than others given
the same prescription? Is there a name for this?

[Lucille]

I don't think mid-index lenses would shift the image more than high-
index
lenses given the same prescription. I have glasses with my -7.50
nearsightedness
correction in both high and mid-index and they 'shift' pretty much the
same.

I call it the coke-bottle effect.

[Chuck Knight]

It's a distortion caused by the *strength* of the lens. High or low
index, thin or thick, the lens remains the same strength.

The only way to get rid of it, is to move the lens...on this list, we
often recommend smaller lenses for thicker prescriptions, partly for
this reason. If the edge of the lens doesn't "hang over" the side of
your face, the *effect* is greatly reduced.

-- Chuck Knight

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