Visionstar OD1-AP A Scan & Pachymeter

Cataract Biometry and Lens Calculation

Axial length feeds intraocular lens power calculation, and resolution of 0.01 millimetres with accuracy of plus or minus 0.02 bears on the refractive outcome. Six formulas give a surgeon the choice their practice requires, with the selection itself a surgical judgement rather than an instrument setting. A wrong axial length gives a wrong lens power. Precision therefore carries real consequence. Six formulas cover most cataract practice. Selection follows the eye being treated.

Services Moving Between Rooms

A console of 200 by 168 by 165 millimetres with a carry handle and internal printer can be moved between clinics rather than occupying one room permanently. Results print where they are taken, without a computer needing to be present. No computer needs carrying alongside the console. Clinics share the instrument between them. Portability and printed output work together. Rooms are shared rather than dedicated.

Corneal Thickness Measurement

A 20 MHz probe resolving to 1 micron across 0.23 to 1.3 millimetres supports thickness assessment. What any measurement means clinically rests with the examining clinician rather than with the instrument producing it. Thickness supports assessment rather than settling it. Interpretation stays with the clinician. Both probe specifications are documented separately. Resolution and accuracy differ between them.

Departments Choosing Measurement Method

Immersion and contact are both available, as are automatic and manual operation. Departments hold settled views on measurement technique, and an instrument supporting both fits existing practice instead of requiring it to change. Neither method is imposed upon the department. Adoption proceeds more smoothly as a result. Automatic and manual operation are both offered. Practice rather than the instrument decides.

Portable Without Losing Function

A carry handle, 5.7 inch touch screen and internal printer in a console of this size means biometry can move between rooms while still producing a printed calculation sheet on the spot. Portability usually costs output; here it does not, which is the practical argument for this instrument over a fixed one. Fixed consoles cannot follow a clinic list around. Output survives the move intact. Printing on the spot avoids carrying results away. Portability usually costs output entirely.

A Full Formula Set

Six named formulas including Haigis and Hoffer-Q covers what most cataract practice requires, with the choice between them staying with the surgeon. Having calculation on the instrument keeps biometry and lens selection in one place rather than introducing a transcription step. Transcription steps invite avoidable error. One instrument keeps the workflow together. Calculation on the instrument keeps it all together. Surgeons retain the formula choice.

Both Methods, Both Modes

Immersion and contact, automatic and manual, all supported. An instrument that accommodates a department's existing technique is adopted more readily than one requiring a change of practice, and the choice stays with the clinicians. Technique preferences vary between departments. Flexibility suits established services. Requiring a change of practice slows adoption. Both methods remain available throughout. Immersion and contact suit different departmental habits.

Three Model Variants

The OD1-A performs A scan alone, the OD1-P thickness alone and the OD1-AP both. Which variant is quoted should be established before anything else. Three instruments share the one designation here.

Biometry Resolution of 0.01 Millimetres

The 10 MHz probe resolves to 0.01 millimetres with accuracy of plus or minus 0.02, read from the corrected table. Refractive outcome depends upon those figures.

Adjustable Gain to 120 dB

Gain adjusts across 0 to 120 dB, letting the operator manage signal strength according to the eye being examined. Signal strength is managed to suit the eye.

Six IOL Calculation Formulas

SRK-II, SRK-T, Binkhorst, Holladay, Hoffer-Q and Haigis are provided. Which suits a given eye remains a surgical judgement. Six options cover most cataract practice.

Four Eye Modes

Normal, aphakic, pseudophakic and dense cataract modes are available, covering the range of eyes a cataract service encounters. Dense cataract in particular needs its own mode.

Immersion, Contact, Auto and Manual

Both measurement methods and both operating modes are supported, so the instrument accommodates existing practice. Existing technique is accommodated rather than changed.

One Micron Pachymetry Resolution

The 20 MHz probe resolves to 1 micron across 0.23 to 1.3 millimetres with accuracy of plus or minus 5 microns. That section of the table is correctly aligned.

Carried Console With Printer

At 200 by 168 by 165 millimetres with a carry handle, 5.7 inch touch screen and internal thermal printer, results print without a computer. Printing happens where the measurement is taken.

The OD1-AP combines A scan biometry and pachymetry in a carried console measuring 200 by 168 by 165 millimetres, with a 5.7 inch colour touch screen and internal thermal printer. Results print on the spot without a computer present. Three variants are available, covering biometry alone, thickness alone or both.

The manufacturer's technical table is misaligned by one row, attributing each value to the label below its proper place. The corrected reading is unambiguous, and this page follows it: a 10 MHz biometry probe resolving to 0.01 millimetres at plus or minus 0.02, gain across 0 to 120 dB, and a range of 15 to 35 millimetres at 1640 metres per second.

Reading the table as printed would have produced nonsense. Measurements cover anterior chamber depth, lens, vitreous and axial length across four eye modes, with immersion and contact methods, automatic and manual operation, and six IOL formulas. The pachymetry probe runs at 20 MHz resolving to 1 micron across 0.23 to 1.3 millimetres.

Results print on the spot without a computer being present. Medigear.uk supplies the OD1-AP as a verified medical equipment supplier and will confirm the variant, the corrected specification against the manufacturer's documentation, mains arrangement, condition and accessories. Lens selection rests with the operating surgeon.