I was out yesterday with my new to me Zeiss 7x42 Classics and was looking at an eagle on the other side of a wide river who was rummaging about on a gravel bar. Focusing, I noted that things were rather blurry. I looked at the diopter setting and saw that they were in their usual place. Cranking on some positive turn, things sharpened up.
This is a phenomenon I have noticed before both with these bins and others. Makes me wonder if my eyes do weird things from time to time.
Anybody else experienced this? Any reason to postulate? Do I need to visit the optometrist?
Thanks.
Yes, I sometimes experience such things.
I'll go along for weeks happy as can be, and it seems like all my binos are great. Then my eyes will seem different, and I'll chase diopters around for a couple of days wearing my eyes out in the process so nothing at all looks quite right, and maybe go back to the old setting, or maybe decide my eyes have really changed and stick with a different adjustment.
At 59 years, I can't complain, but I'm starting to get the picture that aging is not a great idea. At this age, it is typical for nearsighted eyes to become more nearly normal, and my eyes are in fact doing this but not at the same rate for both eyes. Pupil dilation is weakening, which affects focus error and astigmatism effects when looking at stars. Focus accomodation is shot to pieces. It's nuts. But my basic visual acuity is still there, I just have to deal with all this stuff occasionally to realize the views I'm after. And its different with every bino. Stuff like this is why for me, a new binocular, however good, is likely to be as much a pain in the rear as bliss.
I'm glad to hear you've got eagles, even if somewhat blurry, to look at with your grand Zeiss ClassiC!
Ron
I'm 42 and I get this. Some days my eyesight is better than others. No drastic changes but noticeable differences. I remember getting it when I was a teenager too. I have been very short-sighted since childhood though so it may be to do with that.
Your eye-sight does vary a lot though. Especially if you are ill or run down. That is why, before you have an eye test, the optometrist asks if you've been ill recently. I consider it to be just one of those things. If I were a runner, then I would run faster or slower from day to day so why should seeing be any different.
If I started noticing big differences I would get an eye test though. Straight away. I have one every year whether I feel I need one or not. An optometrist can pick up on other issues from your eyes, like diabetes and high blood pressure, so it's got to be worth it.