Visionstar LM-300

Fitting Height Difference

Lens PH difference is measured from 0 to 50mm in 0.25mm steps, recording how far the fitting height of one eye differs from that of the other.

Frame Leg Length

Measurable lens frame leg length runs from 0 to 160mm, which is a frame dimension recorded on the same instrument that measures the lenses themselves.

Full Circle Prism

Prism base angle sweeps 0 to 360 degrees in 1 degree steps, with prism degree reaching 0 to 20 in both horizontal and vertical directions in 0.01 increments.

Graded Ultraviolet

Anti-ultraviolet transmittance is measured from 0 to 100 per cent in 1 per cent steps, giving a figure rather than a simple yes or no for a coating.

Spectacle and Contact Powers

Spherical power runs minus 25 to plus 25 for spectacle lenses and minus 20 to plus 20 for contact lenses, with cylindrical power minus 9.99 to plus 9.99.

Four Vertex Power Steps

Vertex power step measurement is offered at 0.01, 0.06, 0.12 and 0.25, so an operator can work as finely as a particular task happens to require.

Lens Acceptance

Measurable lens diameter runs 10 to 100mm, centre thickness is stated as 20mm or under, and lens PD is measured from 40 to 82mm in 0.25mm steps.

Screen and Printer

The screen is an 800 by 480 colour display described as fully touchable, with thermal printing onto paper of 57mm width for a record of the measurement.

Progressive Lenses on Uneven Faces

PH difference measurement is the reason to choose this instrument. Faces are rarely level, and a progressive lens set to one height sits correctly for one eye and slightly wrong for the other. Recording the difference lets the dispense account for it, which is what separates a lens a patient settles into from one they tolerate without ever quite knowing why it feels a little wrong.

Complete Dispensing Records

Frame leg length alongside PD, PH difference and the lens powers means one instrument describes both the spectacles and the lenses in them. For a practice that later has to remake a pair, or match a replacement to what a patient already wears, having the frame dimensions recorded at the same sitting saves a good deal of measuring work after the event has passed.

Verifying Protective Coatings

Anti-ultraviolet transmittance graded from 0 to 100 per cent turns a protective claim into a number. Where a lens is sold on that property, a practice can document what it actually transmits rather than repeating an assurance from further up the chain, and the thermal printer puts the figure onto paper at the same sitting as the measurement was itself taken.

Prismatic Prescriptions

A base angle sweeping the full circle, with 20 available in both horizontal and vertical directions and 0.01 increments, covers prismatic work that a narrower instrument would refuse. Orientation matters as much as magnitude with prism, so recording the base angle right around the circle removes ambiguity about how a correction has actually been worked into a finished lens.

The Difference Between the Eyes

Most instruments give a single fitting height. This one gives the difference between the two, which is the figure that matters when a face is not level. A progressive lens dispensed on a single height puts the corridor slightly wrong for one eye, and the resulting complaint is hard to diagnose because nothing about the lens looks incorrect at all. Measuring the difference removes that whole failure well before it ever reaches a patient.

Frame and Lens on One Record

Recording the frame leg length alongside the optical figures is unusual, and quietly useful. A dispensing record that describes the spectacles as well as the lenses is what makes a remake or a replacement straightforward months later, when the original frame may no longer be to hand and somebody is otherwise measuring from memory or from an approximate note left in a file somewhere at the practice.

Prism Properly Bounded

Twenty in both the horizontal and vertical directions, with a base angle across the full circle and 0.01 increments, is a generous prism specification. Prism is where narrower instruments most often run out, and for a practice handling prismatic prescriptions, an instrument that records both magnitude and orientation conclusively is what makes a verification genuinely worth the having at all.

The Visionstar LM-300 measures spherical power from minus 25 to plus 25 for spectacle lenses and minus 20 to plus 20 for contact lenses, with cylindrical power and progressive addition each minus 9.99 to plus 9.99, and vertex power steps of 0.01, 0.06, 0.12 and 0.25. Cylindrical axis covers 0 to 180 degrees, prism base angle sweeps 0 to 360 degrees, and prism degree reaches 0 to 20 horizontally and vertically in 0.01 increments. Lens diameter runs 10 to 100mm, centre thickness is 20mm or under, lens PD is measured 40 to 82mm, PH difference 0 to 50mm and frame leg length 0 to 160mm. Anti-ultraviolet transmittance is graded 0 to 100 per cent, the screen is an 800 by 480 touchable colour display, and printing is thermal on 57mm paper.

Two points are handled deliberately. The Hartmann area measurement description, the spot data and processing figures, and the claim regarding Abbe constant compensation are the manufacturer's own account, reported here rather than endorsed. The power supply specification is not reproduced, and no dimensions or weight appear on the material held.

If your practice dispenses progressive lenses, keeps records that describe the frame as well as the lenses, or handles prismatic prescriptions, speak to Medigear.uk. As a verified medical equipment supplier working across medical, dental, rehabilitation and aquatic therapy settings, the team will confirm the full configuration.