LINK ML-600A

Heterophoria and Binocular Vision Assessment

Maddox rods in both orientations, combined with rotary prism to 20 prism dioptres, allow horizontal and vertical phoria to be measured and quantified during the same appointment as the refraction. Patients presenting with headaches, intermittent diplopia or reading discomfort frequently have a binocular cause rather than an uncorrected refractive one, and an instrument carrying the necessary lenses makes that investigation a natural continuation of the sight test instead of a separate undertaking.

Dissociated and Polarised Testing

Polarising filters at 135 and 45 degrees support tests that present each eye a different image while both remain open. Binocular balance, fixation disparity and associated phoria work all depend on that dissociation. Having the filters built into the head means the sequence runs without interruption, which matters because the patient's binocular state is easily disturbed by the act of changing equipment mid test.

Duochrome and Retinoscopy Within One Head

Red and green lenses allow the spherical endpoint to be confirmed chromatically rather than by sharpness judgement alone, which is particularly useful with patients who find discriminating between similar presentations difficult. The plus 1.50D retinoscopy lens fitted as standard means objective retinoscopy can be performed at the working distance through the same head, before subjective refinement begins.

Routine Subjective Refraction

For everyday sight testing, spherical coverage from minus 19.00 to plus 16.75 and cylindrical power to minus 6.00D, both in quarter dioptre steps, handle the great majority of prescriptions. Three selectable cross cylinder powers let astigmatic refinement proceed at a step the patient can actually judge, and the plus 0.12D sphere allows finer spherical adjustment where a patient discriminates it.

Investigation Without Interruption

When a refraction raises a binocular question, the practitioner either investigates it now or defers it. Having Maddox rods, polarising filters and prism already in the head makes investigating it now the path of least resistance. That matters clinically, because the binocular problems most often missed are precisely the ones that would require fetching equipment at the end of an already lengthy appointment. Convenience quietly determines which investigations actually get done in a busy clinic.

Cross Cylinder Matched to the Patient

A cross cylinder step that a patient cannot reliably distinguish produces guesswork dressed as data. Three selectable powers mean the practitioner can move to a coarser step for patients who struggle and a finer one for those who discriminate well. The quality of an astigmatic refinement depends almost entirely on whether the patient can genuinely tell the two presentations apart.

Mechanical Durability Where It Counts

Metal gearing addresses the part of a refracting head that actually wears out. Dials and linkages are operated constantly, and a head whose mechanism develops play gives readings that drift from what the scale indicates. Specifying metal gears is a decision about the instrument still being accurate in its tenth year, not about how it performs when new. Longevity is worth more than any single specification figure.

Maddox Rods in Both Orientations

Vertical and horizontal Maddox rods are both provided, so horizontal and vertical phoria can each be measured without changing instruments or reaching for a trial frame.

Polarising Filters Fitted

Polarising filters are set at 135 degrees for the right eye and 45 degrees for the left, supporting the dissociated tests that depend on presenting each eye a separate image.

Red and Green Lenses

Red and green lenses are included for duochrome work, allowing spherical endpoint to be confirmed by a method independent of the patient's judgement of sharpness alone.

Retinoscopy Lens as Standard

A plus 1.50D retinoscopy lens comes fitted, so retinoscopy at the working distance is performed through the head itself without an additional lens being introduced.

Three Cross Cylinder Powers

Cross cylinder is selectable at plus 0.25D, plus 0.37D or plus 0.50D. The step can be matched to what an individual patient discriminates reliably rather than fixed in advance.

Full Circle Axis Scale

The cylinder axis carries a 360 degree scale, doubled across 180 degrees and marked in 5 degree steps, giving a clear reading of orientation from either side of the head.

Metal Gearing Throughout

The manufacturer specifies metal gears, citing closer matching precision and durability. Controls on a refracting head are adjusted constantly, so mechanical longevity is not a trivial consideration.

Open Aperture and Pupillary Check

An open aperture position and a marked position for checking pupillary distance regulation are both provided, alongside a plus 0.12D sphere for fine spherical refinement.

The LINK ML-600A auxiliary lens phoropter is specified for practitioners who want the whole examination inside one instrument. Maddox rods in vertical and horizontal orientations, polarising filters at 135 and 45 degrees, red and green lenses, a plus 1.50D retinoscopy lens fitted as standard, an open aperture, a plus 0.12D sphere and a pupillary distance check position together cover the tests a thorough examination calls for.

Spherical power runs from minus 19.00 to plus 16.75 and cylindrical power to minus 6.00D, both in 0.25D steps, with a 360 degree axis scale doubled across 180 degrees in 5 degree steps. Cross cylinder is selectable at plus 0.25D, plus 0.37D or plus 0.50D, prism covers 0 to 20 prism dioptres in single steps, and pupillary distance adjusts from 48mm to 75mm. Metal gearing is specified throughout. Because the sheet omits weight and dimensions and gives electrical figures without explaining what they serve, those points warrant confirming alongside mounting arrangements, compatible stands, certification status, condition and reseller and listing rights for the manufacturer trademark. A refracting head of this kind stays in service for many years, so settling the specification at the outset repays the effort. Contact Medigear.uk, a verified medical equipment supplier, and we will establish exactly what a given head provides.