One of my latest senior citizen in home computer tutoring clients here in Kailua Hawaii on Oahu has trouble seeing both the screen and the keyboard due to macular degeneration.
I recommend this 27 inch Acer computer monitor. QHD screens otherwise known as WQHD, are noticeably sharper than Full HD (FHD) aka 1080p resolution (1920 x 1080) models, which are much more common and also cheaper than QHD displays. This higher resolution also makes going to screens larger than 27 inches without seeing individual pixels more feasible when shopping for a PC monitor. However, with laptops, a QHD screen will eat up more battery than a FHD display. My in home computer tutoring client here on Oahu has a desktop computer so battery length is not a factor.
Acer Predator XB271HU bmiprz 27" WQHD (2560x1440) NVIDIA G-SYNC IPS Monitor, (Display Port & HDMI Port, 144Hz), Black 
My in home senior citizen computer tutoring client is also experiencing some dexterity issues. If you know any computer uses with dexterity issues see my article/Google Slideshow on
Senior Computer Users with Dexterity Issues. Here's What to Do....
Contact Dual Certified Teacher and Computer Expert J. Richard Kirkham B.Sc. for in home computer lessons for senior citizens and small business owners. 
https://mobilecomputersupportoahu.com/
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