Artibetter 2pcs Round Optical Cross Cylinder Lens Tool Set diopters Optical Instruments diopters kit (0.25/0.5)

It’s quite amazing the extraordinarily useful stuff that can be sourced on Amazon and on next day delivery! These cylinder 0.25 dioptre and 0.5 dioptre test lenses fulfilled their purpose perfectly.For anyone not sure why their vision is just a little fuzzy and suspect they have a small amount of uncorrected astigmatism, these test lenses will settle the issue independently of a full vision test at an optician.In my case I needed to make up some temporary distance glasses. Lenses up to 2 dioptres are easy to source on Amazon but I never thought I would be able to tune out the small amount of residual astigmatism as well. Then I found these cylindrical lenses.Whether they are the absolute limit in quality and precision I don’t know (for the price one would not expect the ultimate in precision) but they were certainly precise enough for the reasonably critical use I purchased them for.footnote - the markings identify the cylinder axis correctly, when measured with a micrometer the glass is thinnest where the axis marking is, so since these are concave lenses this is correct.

Has a sharp edge on which is very dangerous

These cross cyls do not work, tried on 2 patients and compared to others ordered before somewhere else and have completely different results.

They are wrong! The markings can't be trusted!