A number of features offered by these glasses are included in my purchase decision criteria: rimless, bifocal, spring hinge, photochromic reading glasses. Bonus: Get two pairs for the price. The two features I would suggest are the shape of the lenses and the ability to adjust the nose, these two additional features will likely increase the cost. The shape of the lenses is typical of standard disposable readers. I prefer round lenses, especially if the lenses are multifocal. The second feature I prefer is the greater flexibility to adjust the nose pads to position the bifocal lens line of sight and position the goggles on my face. The nose pieces are attached to the bridge of the nose, leaving no flexibility to adjust your glasses to your face and eyes. Due to the shape of the lenses and lack of more flexibility in adjusting the glasses, this means I'm looking over the top of the lens, which negates the benefit of photochromic/sunglasses. You get what you pay for, 2 pairs of spring-hinged, borderless, bifocal, photochromic readers. Since these glasses met my immediate needs, the glasses will work, but I will replace them if I find glasses that meet all of my selection criteria. Hence the 4 star rating.
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