Font size seems to be 8 font and this is not suitable for those without perfect sight.
I cannot find a way to change the font size. This should be easy and a basic setting. Please provide a simple font size change in settings.

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Hi Robert, you can increase your font size on Desktop. In your desktop settings, scroll down under Inbox Spacing, but above More Settings. There you will see Increase text size for readability. Let us know if you have any trouble. Thanks.
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Hannah Spencer commented
Please change the font that EVERYTHING on my Yahoo desktop is. I can barely read it, which gives me a headache from focusing on it. I noticed in various threads that others had the same issue and theirs updated to this font as well. The font is too small, narrow, and crowded. Please update this to something with more spacing between the letters.
The font that this entire page shows and what it shows I am typing in right now is the same font everything else shows. I am very tech-savvy and couldn't find anything on how to update this feature in my browser or yahoo settings.
Please advise on how I can update this myself if needed. I use Google Chrome