LINK PD-28

Right, left and total, all shown at once

The LINK PD-28 is an interpupillary distance meter displaying the right, total and left figures together. It measures 45 to 82mm binocularly and 22.5 to 41mm for each eye, focuses from 30cm to infinity, and states its measuring error within 0.5mm.

Sections

PD Meters & Small Accessories

Progressive and High Power Dispensing

Monocular measurement across 22.5 to 41mm for each eye is what these lenses require. Monocular centration is rarely symmetrical, and halving a binocular total therefore places the optical centre wrongly on at least one eye. In a progressive lens the corridor is narrow enough that the wearer notices, and in a high power lens the prismatic effect of a displaced centre scales with the power, so both patient groups depend on the individual figures being measured rather than derived.

Reading and Near Correction Dispensing

Because the focusing point range extends from 30cm to infinity, near centration is measured rather than estimated from the distance figure. The eyes converge for close work, so near pupillary distance is genuinely smaller, and a reading correction centred on the distance value puts the optical centres outside where the patient looks through. Measuring both properly is straightforward on this instrument and worth the moment it takes.

Practices Wanting Defensible Records

Published measuring ranges and stated error figures mean a recorded centration value comes with a known tolerance. Where a patient queries a dispensing outcome, or where an internal review examines a remake, being able to say what the instrument's stated accuracy is puts the discussion on firmer ground than an unqualified number from an instrument whose specification says nothing about error.

Everyday Dispensing Throughout the Day

Two AA cells, automatic shut off and handheld operation make this a straightforward instrument to keep in constant use. It goes to the patient rather than the patient coming to it, the cells are replaceable in seconds from any stationery drawer, and nothing gets left running to flatten overnight.

You Know What the Instrument Can Do

A published measuring range and a stated error figure answer two questions that otherwise get answered by assumption: whether an unusual patient falls within the instrument's compass, and how much a borderline reading can be trusted. Specifications like these are easy to overlook when comparing instruments and genuinely useful once one is in daily service. Published figures reward attention at the point of choosing. Buying on stated figures rather than impressions is simply sounder practice.

Both Centration Figures From One Instrument

Distance and near pupillary distances differ, and dispensing both from a single measured value guarantees one of them is wrong. Covering 30cm through to infinity means the instrument produces both properly. For practices dispensing reading corrections and progressives in volume, that is not a refinement but the basic requirement. One instrument covering both removes a reason to approximate. Dispensing both from a single value guarantees one is wrong.

A Complete Record at a Glance

Displaying right, total and left simultaneously means the full centration picture is read in one look. It also provides an immediate internal check, because a binocular total that does not match the sum of the two monocular figures signals that something needs repeating before the lenses are ordered. Catching a discrepancy before ordering costs nothing at all. A remake avoided repays a great deal of attention at the measuring stage.

Published Measuring Ranges

Binocular measurement covers 45 to 82mm and monocular measurement 22.5 to 41mm for each eye, so you know in advance whether an unusual patient falls inside the instrument's compass.

Stated Error Figures

Indication error and rounding error are each given as 0.5mm or better. Knowing the tolerance lets the dispenser judge how much weight a borderline reading should carry.

Near and Distance Measurement

The focusing point range runs from 30cm to infinity, so centration can be measured for close work as well as distance, and the two figures recorded separately as they should be.

Three Readings Displayed Together

Right, total and left figures appear on the display at the same time, giving a complete centration record at a glance rather than three separate measurements to combine.

Monocular Measurement for Each Eye

Each eye is measured individually rather than inferred by halving a binocular total, which is what progressive and higher power lens dispensing genuinely requires.

Automatic Shut Off

The instrument switches itself off after one minute of inactivity, preserving the cells between patients without anyone needing to remember to turn it off.

Ordinary Battery Operation

Two AA cells power the meter. They are inexpensive, available anywhere and quick to change, which suits an instrument used many times through a dispensing day.

Handheld Operation

The meter is used in the hand at the patient's face, so measurement happens wherever the patient is sitting rather than requiring them to move to a fixed instrument.

The LINK PD-28 interpupillary distance meter is specified more fully than instruments of this type usually are. Binocular measurement covers 45 to 82mm and monocular measurement 22.5 to 41mm for each eye, with indication error and rounding error each stated at 0.5mm or better. The focusing point range runs from 30cm through to infinity, so near and distance centration are both measured rather than one being derived from the other.

Right, total and left figures appear together on the display, giving a full centration record at a glance and an immediate check that the monocular values sum correctly. Two ordinary AA cells power the meter and it shuts off automatically after a minute of inactivity. Physical dimensions, weight and display details are not stated on the manufacturer sheet, so those, along with certification status, condition and reseller and listing rights for the manufacturer trademark, all warrant confirming. For an instrument picked up many times a day across years of service, settling those points at the outset is worth the short conversation it takes. Speak to Medigear.uk, a verified medical equipment supplier, and we will establish every one of those remaining points for you, well before you are asked to commit to anything at all.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

Binocular measurement runs from 45 to 82mm and monocular measurement from 22.5 to 41mm for each eye. Having those published means you can establish in advance whether a patient with an unusually narrow or wide centration falls inside what the instrument will read. Few instruments of this type publish both figures.

The manufacturer states an indication error of 0.5mm or better and a rounding error of 0.5mm or better. A stated tolerance is genuinely useful, because it lets the dispenser judge how much weight a borderline figure should carry rather than treating every reading as exact. Tolerance stated openly is worth more than accuracy merely claimed.

Yes. The focusing point range runs from 30cm through to infinity, so both are measured on the same instrument. That matters because the eyes converge for close work, making near pupillary distance genuinely smaller than the distance figure rather than identical to it. Recording both properly takes only a moment longer.

Right, total and left readings appear together, which gives the full centration record in one look. It also provides a useful check, since a binocular total that does not agree with the sum of the monocular values indicates that a measurement should be repeated. Spotting a discrepancy early is far cheaper than discovering it later.

Monocular centration is rarely symmetrical. Halving a binocular total therefore places the optical centre wrongly on at least one eye, which a progressive lens corridor is narrow enough to reveal and a high power lens amplifies through prismatic effect. The error is small, consistent and entirely avoidable.

Two ordinary AA cells. They are inexpensive, available anywhere and quick to change, which suits an instrument in constant use. An automatic shut off after one minute of inactivity means the meter is not left running between patients. Replacing cells takes seconds and needs nothing from a service visit.

It switches the instrument off after a minute without use, preserving the cells. For a device picked up and put down many times a day, that removes any reliance on somebody remembering to turn it off before moving on to the next task. Flat cells discovered mid appointment are an avoidable irritation.

The manufacturer sheet does not state physical dimensions, weight or the display arrangement. Those are worth establishing with Medigear.uk rather than assumed, particularly if the instrument will travel between sites or be used alongside other equipment. Bench space and bag space are both worth checking beforehand.