Manual or Automatic Lensmeter: Which One to Buy
What each type measures, how fast it is, what it needs from the operator, and which shops need which.
Updated September 2026 · 6 min readThe short answer
Both types measure the same things: sphere, cylinder, axis, add and prism. An automatic lensmeter is faster, removes operator variation and usually adds extras. A manual lensometer costs less, needs no software and keeps working when the electronics do not, but it needs a trained operator.
Busy shops and labs tend to use an automatic model every day and keep a manual one as a backup. A small shop with a trained optician can start with a manual instrument.
Side by side
| Manual lensometer | Automatic lensmeter | |
|---|---|---|
| How it reads | You focus a target through an eyepiece and read the power wheel | A light beam passes through the lens onto a sensor; the instrument calculates the power |
| Operator skill | Needs training; results vary between operators | Little training; readings are repeatable |
| Speed | Slower; depends on the operator | Faster; the reading appears on screen |
| Progressives | Possible with care, using the engravings | Guided progressive mode on most models |
| Extras | None | Often UV and blue-light transmittance, PD, printing and data output |
| Power and parts | A lamp; no software | Electronics, touch screen, printer paper |
| Typical role | First instrument in a small shop, or backup | Main instrument in a busy shop or lab |
| Our models | CP-1B: 0 to ±25 D, 0.125 D graduation, prism to 20 Δ | HV-600: 0 to ±25 D, 7" touch screen, UV and blue-light test |
Which one for which shop
- New shop, low volume, experienced optician: a manual lensometer is enough to start. Add an automatic model when volume grows.
- Busy retail shop: an automatic lensmeter speeds up verification and final checks, and anyone on the team can use it.
- In-house finishing lab: automatic for throughput and records, with a manual unit as backup.
- Shops selling coated and filtering lenses: an automatic model with UV and blue-light transmittance lets you show customers what a lens does.
What to check before you buy
- Measuring ranges against your prescriptions: sphere, cylinder, add and prism.
- Display steps (0.01, 0.12 or 0.25 D on many automatic models) and prism notation (x-y or polar).
- Progressive mode, if you dispense many progressives.
- Printer and data output, if you keep job records.
- Transmittance, PD and pupil height measurements, if you will actually use them.
- Voltage and plug for your country, and a supply of paper and ink.
Why many shops keep both
An automatic lensmeter is an electronic instrument; if it needs service, the shop still has to check glasses. A manual lensometer on the shelf keeps work moving, and it is the instrument opticians learn on, so it doubles as a training tool.
Background sources: Lensometry (StatPearls, NCBI Bookshelf) · Lensometry handout (University of Utah, Moran CORE)
Questions
Is an automatic lensmeter more accurate?
It is more repeatable, because it removes the operator’s eye from the reading. A trained operator with a well-focused manual instrument reads within normal tolerances.
Can I use an automatic lensmeter for layout before blocking?
Yes. Mark the optical center with the instrument’s marker, then block the lens.
Does an automatic lensmeter need calibration?
Check it on a known lens regularly; many models include an automatic calibration program.
Which is easier to train staff on?
The automatic model. The manual one takes practice, especially for cylinder and prism.