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Vincentt's avatar

Reading glasses with negative corrective power?

Asked by Vincentt (8079points) December 8th, 2014

First of all, I’m hoping this makes sense in English—I’m not sure whether terms and units of measurements are similar in the rest of the world…

As I understand it, reading glasses usually have positive corrective power (they are labelled e.g. ”+2.0” or ”+1.5” or something). I am nearsighted, needing glasses of -2.0.

Since I usually wear contact lenses, I didn’t really want to spend too much money on glasses, although a pair is nice to have. Whereas there are reading glasses with a certain corrective power available everywhere, they are usually custom-made when you are nearsighted—usually. I came across a cheapr pair that was -2.0, and bought it.

However, the label says they are reading glasses, and: “Warning: For near vision and reading use only.”

When I wear them, I can see just fine again. Why does the label says they are reading glasses, when they help me to see at a distance?

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5 Answers

zenvelo's avatar

It’s because they are not designed for distance, and are not meant for mandatory distance correction needs, such as driving a car or flying a plane.

picante's avatar

This is quite confusing to me. As a near-sighted person, you should be able to read (a near-vision activity) without needing correction. You’d need that -2.0 for the distance activities (driving, etc.) Anything with a negative correction should not be labeled “reading glasses.”

I have no quarrel with reading glasses warning you away from usage for distant-vision activities. I also was not aware that non-prescription negative correction lenses were available.

Like I said, I’m confused ;-)

Vincentt's avatar

@zenvelo But how are they not “designed for distance” when they correct my vision to allow me to see in the distance?

@picante My thoughts exactly – I wasn’t aware that they were available, so I bought them, but the label confuses me.

zenvelo's avatar

@Vincentt You wear them for driving against recommendation, get in an accident, they’ll tell you “we said they aren’t for distance.”

Vincentt's avatar

@zenvelo But why would they say that if they are for distance? Other glasses manufacturers apparently don’t get sued for their glasses. Which makes sense, since they’re clearly not at fault.

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