No effort?
You had several places to see the difference, and they're not all equally affected by dyslexia.
For one, the words you failed to distinguish are
"Ring" and
"Bracelet". Even if your condition makes the letters hard to distinguish, you can still go by the length and overall shape of words, and one of those words is twice as long as the other.
Those words appeared multiple places, any of which you could have checked. It's within the name of the item (both on the vendor's list and the tooltip), and it's also the name of the item
type shown on the tooltip just under the icon.
Speaking of icons, there's another couple indicators of the difference. If you have trouble making out the words, then go by the pictures. The vendor's list shows the icons for each item type along with the name, and the icon for bracelet slot items is quite different than the icon for ring slot items:

Then the tooltip has the icon for the item itself:

Those are very different, though admittedly you wouldn't be as familiar with them. If you want familiarity, the slot icons are distinct enough and you've been seeing
those ones since the day you first started playing this game.
And finally, most players by this point are familiar with the order in which gear is listed. If you simply knew that the ones on the bottom are rings and the ones above that are bracelets, that could also have prevented the error. (Admittedly, relying solely on this last one would be susceptible to error if SE ever changed their sorting pattern, but they haven't yet.)
The gear names are chosen to be very easy to sort out. They each have three pieces of information in a regular, predictable pattern: what
set the piece goes with, what
slot it's for, and what
role it's for. Some players may complain about that uniformity as boring, but it's there to make identification easier.
You know when purchasing gear that those are the three things to look for, and each is available multiple ways, including in the item's name.
Set: First part of the item's name. Also recognizable by its Item Level. And generally known by the fact that it will be the set bought in this place for this currency at this price...
Slot: Middle part of the item's name. Also identified by the item type listed on the tooltip. Also identified by the item type
icon on the vendor list. And can be known by the position where it's sorted within that list.
Role: Final part of the item's name. Also recognizable by which stats it boosts. Also recognizable by the list of jobs that can equip it. (In many cases, this can also create a warning if you try to buy items for a job you're not currently on.)
You simply need to be sure you've double checked each of those three things before you purchase. They're each available multiple ways, so you can pick whichever of those ways is least disrupted by your dyslexia.