Star Testing you Eyes
There it was, mid-day, and the sun shining on the south facing window of
the bathroom. I peer out through the glass and the screen beyond to get
a glimpse of the sky, and the condition of the backyard. As I'm looking
out I see this reflection that looks like a star test pattern. What the
heck? I move my eyes around, to and fro and realize that it must be a
Fresnel pattern from my cornea, reflecting off the window.
I'm still uncertain about how this phenomenon occurred, but boy did I
get a good glimpse at what is causing the astigmatism in my eyes at
large exit pupils. There was a flat spot on one portion of the outer
circles in the pattern. Up and left in the reflection.
The Fresnel rings near the center on the other hand, looked absolutely
stunning, perfect. I wish it was that easy to get a good Fresnel pattern
out of my night time skies. I could then dial in the scope to
perfection, and get some decent planetary views. :-)
Stephen Paul
Shirley, MA
|