Think at 70, your eyes are likely pretty well fixed focus.
My optician, a couple of years ago, initially gave me slightly more plus than needed for infinity. Not something you'd notice in the consulting room. But did when driving. His answer was it was a compromise most liked. I didn't.
I'm sure you're right. Mine have been +2.75 (not 2.5) for at least 4 years, perhaps 6.
That is most interesting. It suggests there is an undivulged "agenda" that opticians apply to a patient's prescription, if the use of "most" is taken at face value. Well, if I am not keen and you are not keen, either we are outliers or the premise is wrong. There are many here who wear glasses and are probably long-sighted, I wonder if they have found their new glasses to be unsatisfactory because of that correction?
There isnt any other way to do it.
Yes.
Yes it does.
There is - an Autorefractor.
It doesn?t replace what he doesn?t like.
Fair enough.
Yup. You can correct eyesight in an animal unable to communicate.
You must have noticed that your optician starts with correction very nearly there - even for a first prescription. Because he's measured the power of your eye first.
I hadn't heard of that. Thanks for pointing it out.
The conclusions stated under "Retinoscopy" in that Wiki are based on old papers from about 15 years ago. Even the stated "recent studies..." references papers from 2006 and 2007.
If you look at ref 2, which is from 2005 (
If I do a self-test for reading strength (eg at
Or, I assume, a human unable to read.
Do all opticians use autorefractors now, at least to start the diagnostic process?
I am very short sighted and have never had a problem with my prescribed glasses.
My optician did the autorefractor followed by the test with various lenses the last time just recently.
For decades I chose to wear the glasses that work best for the computer screen at about full arms length from my face even when out and about. The main downside with that approach is that you can fail to recognise people at a distance when out and about.
I now find a real problem with reading the labels on stuff when buying stuff in a supermarket and should really have a second pair to use in that situation so I don?t have to pick up the item to be able to read the label.
But I am about to have the cataracts done so havent bothered until I see what things are like with cataracts done.
I take it you don't drive?
Yes I do and can read the small street signs with the street name on them and the car number plates fine.
I should have said that its only a problem recognising people when they are a long way away, hundreds of feet away.
Certainly when I was a short sighted kid they used to under-correct for infinity, I suspect based on the theory that your eyes would "try harder" and otherwise deteriorate more rapidly. I always found that slightly irritating. For my "bike" test (silver numberplate days of course) I could not completely read the plate at the requested distance (which was more like 35 yards than 25), but fortunately a couple of paces was all I needed.
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