Tomey OA 2000 Optical Biometer A-scan


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  • Fourier domain axial length measurement
  • + Topography
  • Enhanced usability
  • Connection with ultrasonic measurement unit
  • One-shot IOL power calculation
  • Internal Database
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Product Description

Fourier domain axial length measurement + topography

The Fourier domain method is used as a measuring method thar features high-speed superior tissue penetration. Equipped with a search function that automatically detects a measurable point even when the crystal lens is unclear.

The ring cone method is used to measure the radius of corneal curvature.

In addition to the ø3.0 mm position measured by a general keratometer, ø2.5 mm and ø2.0 mm positions are also simultaneously measured.

Also, up to ø5.5 mm of the cornea is captured and the topography(corneal shape map) is drawn using the ring cone method. The topography is useful for checking eyes after LASIK sugery or corneal irregular astigmatism, or observing the variation

in the corneal shape before and after the surgery. It is also equipment with a function that supports the axis where the toric intraocular lens is to be inserted in the cataract surgery.

IOL power calculation function

The OA-2000 is standard equipped with mine IOL power formulas, including two formulas for eyes after LASIK surgery. Up to 15 types of lens can be registred.

Nine formulas

SRK-II formula, SRK/T formula, HOLLADAY formula, Hoffer Q formula, HAIGIS optimized formula, HAIGIS standard formula, SRK SHOWA formula, <formulas exclusively for eyes after LASIK surgery> Double K SRK/T, Shammas-PL formula ( Will be supported on “OKULIX” “EASY IOL”)

Enhanced usability

In spite of a size that allows the unit to be installed on a compact optical bench, it is equipped with a 10.4-inch large monitor with a tilting function that adjusts the position to the level of physician´s eyes.

Simply touching the center of the pupil displayed on the monitor screen begins alignment. Measurement stars inmediately via the Auto Alignment and Auto Short functions. Even when the physician operates the unit for the first time, intuitive operation is possible. In the event that automatic measurement is difficult, manual measurement is possible using an electric joystick.

Connection with ultrasonic measurement unit

In cases where optical measurement is difficult due to blood in the eyes or other issues, the OA-2000 can be connected wirelessly to the ultrasonic axial length measurement unit AL-4000.

IOL power calculation, data storage and other operations can be performed on the main unit of the OA-2000.

One-shot IOL power calculation

Up to seven sets of measurement data, such as the corneal thickness and anterior chamber depth in addition to the axial length and corneal curvature, can be obtained in one shot time.A series of operations from th examination before cataract surgery to the management after surgery can be performed with one OA-2000, including IOL power calculation, post-surgery data storage, A-constant optimization, and statical processing.


Measurement range

Axial length 14 – 40mm

Anterior chamber depth 1.5 – 7.0mm

Crystalline lens thickness 0.5 – 6.0mm

Corneal thickness 0.2 – 1.2mm

Corneal curvature radius 5.0 – 11mm

Pupil diameter 1.5 – 13mm

Corneal diameter 7 – 16mm

Measurement accuracy

Axial length ±0.03mm

Anterior chamber depth ±0.05mm

Crystalline lens thickness ±0.05mm

Corneal thickness ±5μm

Corneal curvature radius ±0.02mm(

Weight 20 lbs
Dimensions 18 × 18 × 18 in

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