Biometer US-1800

The Nidek US-1800 Biometer - accurately determining the axial length of the eye and corneal thickness.

These measurements are crucial before surgical interventions such as cataract and refractive surgery.

This ultrasound device relies on the reflection of ultrasonic pulses to obtain precise data. It consists of a main unit, a touchscreen, an integrated printer, a probe, an eye test, and a foot switch. Additionally, accessories such as the pachymetry probe and eye test are available as options.

The axial length measured by the US-1800 Biometer is essential for calculating the refractive power of the intraocular lens (IOL), a critical element for the success of cataract surgery. Pachymetry, which measures corneal thickness, is a key parameter for refractive surgery, also allowing the diagnosis of corneal edema.

The operation of this device is based on ultrasonic waves, whose high frequency (1 to 15 MHz) makes them inaudible. These waves travel linearly and reflect or refract upon contact with the surfaces of the various ocular media. The phenomenon of piezoelectric effect is used to convert these ultrasonic pulses into electrical signals.

When using the US-1800 Biometer probe, ultrasonic pulses pass through the eye, generating echoes upon contact with the various ocular structures. The time difference between these echoes is used to calculate the axial length of the eye, providing crucial information for surgical planning.

To measure corneal thickness, ultrasonic pulses are transmitted and reflected from its anterior and posterior surfaces. Again, the time difference is used to determine the corneal thickness. Precise alignment of the ultrasonic waves with the visual axis is essential for accurate measurement of the axial length, which is crucial for assessing the clinical impact of various interventions, medications, or contact lenses on the corneal endothelium.

It is particularly useful in cataract surgeries and refractive surgery, such as radial keratotomy (RK) and LASIK.

• Dimensions: 312 (W) × 262.5 (D) × 202.5 (H) mm
• Weight: Approximately 6 kg

• Voltage: 115 VAC, 230 VAC ±10%
• Frequency: 50 Hz
• Power Consumption: Less than 50 VA

• Color LCD Screen: 10.4 inches

• Corneal Thickness Measurement Method: Reflection of ultrasonic pulse method
• Measured Parts: Corneal thickness (Stores up to 33 points)
• Accuracy: ±5 μm (This accuracy is instrumental and not clinical)
• Measurement Range: 200 to 1300 μm
• Speed of Sound in the Cornea: 1640 m/s
• Displayed Measurement Step: 1 μm