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 recommended this reduced price 27 inch PC monitor so we can make her text and images larger without losing quality.
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.
ViewSonic VA2719-2K-SMHD 27 Inch IPS 2K 1440p LED Monitor with Ultra-Thin Bezels, HDMI and DisplayPort Inputs for Home and Office 
If it's in your budget I recommend This excellent and clear 27 in the monitor which will give you even better definition.
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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