+3.75 reading glasses
What the number means and how to tell whether it is right for you.
- Focuses at
- 10 in (27 cm)
- Typical age
- Above the usual age charts
- For a screen instead
- +2.50
The +3.75 line
This strength is above the range of the chart. If you think you need it, see an eye doctor first.
What +3.75 means
The number is the power of the lenses in diopters. A +3.75 lens brings things into focus at 10 in (27 cm) for an eye that has no close-up focus of its own. Your eyes add their remaining focus on top, which is why +3.75 readers work at normal reading distance for people who still have some.
This is a high strength. It suits people whose close-up focus is mostly gone, usually after 60, or who read at a short distance.
Who typically uses +3.75
It is stronger than the usual age charts go. Age is only a guide. The test gives a figure based on your own eyes.
+3.75 compared with +3.50
+3.50 is one step weaker. The difference is small: print looks slightly smaller and you can hold it a little farther away. If both feel fine, choose +3.50.
+3.75 compared with +4.00
+4.00 is one step stronger. Move up only if small print is still soft with +3.75 after twenty minutes of reading.
Using +3.75 at a computer
A screen is farther away than a book, so it needs less. If +3.75 suits you for reading, about +2.50 suits a monitor at 24 in (61 cm). Wearing your reading strength at a monitor makes you lean in. See reading glasses for computer use.
Questions about +3.75
What does +3.75 mean on reading glasses?
It is the lens power in diopters. The plus sign means the lens adds focusing power for near vision. A +3.75 lens focuses at 10 in (27 cm).
Is +3.75 a strong prescription for reading glasses?
This is a high strength. It suits people whose close-up focus is mostly gone, usually after 60, or who read at a short distance.
What age needs +3.75 reading glasses?
It is above what age charts usually list. People who need it have often had eye surgery or read at a very short distance. An eye exam is the right first step.
Can I wear +3.75 readers all day?
They will not harm your eyes, but everything beyond arm's length looks blurred through them. Take them off, or look over the top, when you look up. More in wearing reading glasses all the time.