Visionstar YZ-23B

Magnification and Field

Magnification is listed at 1.65X with a field diameter given as greater than 56mm, which sets how much of each picture the patient sees at once.

Tube Rotation on Two Axes

Around the erect axis the tubes converge to 50 degrees and diverge to 40 degrees. Around the horizontal axis they move through plus or minus 30 degrees.

Picture Movement and Rotation

The pictures move up and down along the optical axis through plus or minus 10 prism dioptres and rotate around that axis through plus or minus 20 degrees.

Interpupillary Adjustment

Interpupillary distance adjusts from 45 to 75mm, covering the range met across adults and children without an accessory being fitted.

Manual or Automatic Flashing

Flashing runs manually or automatically at the practitioner's choice, with automatic frequency in ten steps across 30 to 300 times per minute.

Four Flashing Patterns and Duty Cycles

Both eyes together, alternating, one on with the other off, and one switching while the other is held are all listed, with duty cycles at one quarter, one half and three quarters.

Haidinger Brushes and Red Light

An adjustable pair of Haidinger brushes runs at 50 to 100 rounds per minute, alongside a red light coruscation system listed at 640nm.

Twenty Picture Pairs and LED Illumination

Twenty pairs of pictures at differing angles are supplied, with LED illumination described as even and low in heat, and optional pictures for stereoacuity work.

Strabismus Assessment

Measuring the angle of deviation is the classic use of an instrument like this. Tubes converging to 50 degrees and diverging to 40 degrees around the erect axis, with plus or minus 30 degrees vertically, cover the ranges an orthoptic clinic meets. Picture rotation through plus or minus 20 degrees around the optical axis allows torsional components to be examined too. A clinic measuring deviation this way records a figure it can compare directly against the same measurement taken months later.

Amblyopia and Fusion Training

The manufacturer lists treatment alongside diagnosis, with simultaneous viewing, syncretic viewing, solid viewing and afterimage among the functions. Flashing at a controlled frequency and pattern is central to that work, and having ten frequency steps between 30 and 300 times per minute together with four switching patterns gives the practitioner room to match the regime to the patient rather than to the equipment.

Eccentric Fixation Work

A pair of Haidinger brushes is supplied, adjustable between 50 and 100 rounds per minute. The Haidinger phenomenon depends on the macula itself, which is what makes it useful when the question concerns where a patient is actually fixating rather than where they appear to be. A red light system at 640nm is listed alongside the brushes within the same instrument, so this work needs no separate equipment.

Stereoacuity Measurement

Optional pictures are listed for quantitative measurement between 40 and 1000 seconds of arc. That range spans from fine stereopsis down to gross levels, letting a clinic record a figure at review rather than a general impression. Twenty picture pairs at differing angles come as standard, covering the routine assessment and training work, so routine sessions need nothing beyond what is supplied.

Assessment and Treatment on One Instrument

A synoptophore earns its place because the same equipment that measures a deviation can be used to work on it. Simultaneous, fusion and stereo viewing, afterimage work and controlled flashing all sit on this one unit, alongside the measurement functions. For a department seeing patients repeatedly over months, that continuity matters: the instrument that established the baseline is the instrument delivering the therapy and recording whether it is working.

Control Over the Stimulus

Ten flashing frequencies between 30 and 300 times per minute, three duty cycles and four switching patterns together give a practitioner a large number of distinct regimes, all describable and repeatable. In work where the therapeutic effect depends on precisely how a stimulus is presented, being able to record what was used and reproduce it at the next appointment is what allows a course of treatment to be evaluated at all.

Adjustment for the Patient in the Chair

Interpupillary distance from 45 to 75mm, tube rotation on two axes and picture movement in both vertical prism and torsion mean the instrument adapts to the patient rather than the reverse. Orthoptic caseloads run from young children to adults, and an instrument that accommodates that span without accessories keeps a clinic moving through a list without interruptions to reconfigure between one patient and the next.

The Visionstar YZ-23B is a full featured instrument for binocular vision work. Magnification is 1.65X across a field listed as greater than 56mm, the tubes converge to 50 degrees and diverge to 40 degrees around the erect axis and move plus or minus 30 degrees around the horizontal, and the pictures shift plus or minus 10 prism dioptres vertically and rotate plus or minus 20 degrees. Interpupillary distance covers 45 to 75mm, flashing runs manually or automatically across ten steps between 30 and 300 times per minute, and twenty picture pairs are supplied with Haidinger brushes at 50 to 100 rounds per minute.

This page states what the technical data states. The electrical specification and power consumption are deliberately not given here, and dimensions, mass, configuration and condition do not appear on the material held. Nothing here should be read as a claim about testing or regulatory approval. Medigear.uk will confirm each of those points along with the full model designation.

If your department assesses and treats binocular vision and wants the specification checked against the caseload you actually see, speak to Medigear.uk. As a verified medical equipment supplier working across medical, dental, rehabilitation and aquatic therapy settings, the team will confirm what this instrument offers and help you judge whether it suits your clinic.