There are some similar "tests" at https://www.youtube.com/watch?v=Mnl5Cd38JYU. Yes, I got them too!

And so did I! Thanks for the link, Geoff.

you’ll see a different number depending on the ambient lighting conditions and your display brightness and contrast settings

As I suggested above. However my (and Gordon's) settings must be pretty good because the full number was apparent without too much difficulty and without tweaking. The outer figures however did call for close attention.

There are some similar "tests" at https://www.youtube.com/watch?v=Mnl5Cd38JYU. Yes, I got them too! I suppose my ophthalmologist is doing a good job!

I'm not sure what William was concerned about - but that's just William, I suppose.

I have revised my result: now: 3452839

Shows the power of PagePlus Photolab. I increased the exposure control. Without this, eyeballing the image, I could see only those I earlier posted.

Even without resorting to tweaks in an image editor you’ll see a different number depending on the ambient lighting conditions and your display brightness and contrast settings. Viewing the image on my iPad I only saw 4528 at first, but when I scrolled up and down a little I saw 45283 and then 3452839. (It’s quite easy to mistake the 4 for a 1 if you can’t see the initial 3, and it’s equally tempting to read that 3 as an 8.)

Shows the power of PagePlus Photolab. I increased the exposure control. Without this, eyeballing the image, I could see only those I earlier posted.

Careful what you post, you may be putting personal medical information on the internet.

I think it more likely that you will be showing the limits of your particular screen and/or video card.

William