Background: For driving, I have needed glasses for at least a decade. Now that I am middle aged, I find that I will soon need glasses for reading also (actually I have no problems reading most anything - the problem is when I need to see something at a very short focal distance). At my last eye exam, the eye doc mentioned that I was border line for needing glasses for close-up. He suggested the "no-line, transition bifocals where one moves the head as needed to look thru the varying lens. He said that it does take time to mentally / physically adjust to moving one's head for correct vision. I asked what the shortest focal length was and he said that 16 +/- inches was the standard but if I needed it different, that the prescription could be modified to provide a (in my case) shorter focal length. I am involved in a variety of activities such as working on older cars and home renovation. It is not uncommon to barely have enough room to squeeze in my head into an opening to get a line of sight so I am thinking of having the focal length as short as 10 to 12 inches.
Wanted: I would like to have glasses with the varying focal length both on the upper ...and... lower portions of the glasses so that when I am working on something overhead that I will not have to crane my head all the way back if the focal length is very short. The local eye glass emporium was not able to find such a lens grind in their catalog. Has any one heard of something like this? If so, what do they call this type of a grind? Where do I go looking for it? As a point of reference, my father, who wears trifocals, had the mid distance ground in the upper edge of his glasses in order to be able to see overhead better. I would be willing to splurge if I could have a varying focal length for over head work. Thanks
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