Contact Lens Oxygen Permeability Tester

The Contact Lens Oxygen Permeability Tester (Polarography Method) is a precision instrument designed to measure the oxygen permeability (Dk) of soft and hard contact lenses, hydrogel, silicone hydrogel, and other high oxygen permeability materials. The instrument provides accurate, repeatable measurements critical for lens manufacturers, laboratories, and research institutions. A complete measurement setup typically includes the main host, electrode assembly frame, electrodes, central thickness gauge, and a controlled temperature and humidity environment, ensuring compliance with international and national standards.

Application

(1) Measurement of oxygen permeability of soft contact lenses (hydrogel, silicone hydrogel).

(2) Evaluation of oxygen permeability in rigid or hard contact lenses.

(3) Quality control of contact lenses in manufacturing facilities.

(4) Research and development of new lens materials with enhanced oxygen permeability.

(5) Verification of compliance with regulatory standards for ophthalmic products.

(6) Laboratory testing of lens prototypes for performance evaluation.

Standards

(1) ISO 18369 – Ophthalmic optics – Contact lenses – Requirements and test methods.

(2) GB/T 11417 – Contact lens oxygen permeability measurement.

(3) ANSI Z80.20 – American National Standard for Contact Lens Oxygen Permeability.

(4) ISO 9913-1 – Ophthalmic materials – Oxygen permeability of polymer materials.

(5) ISO 9913-2 – Ophthalmic materials – Polarographic method for Dk measurement.

Features

(1) Dual input design supports simultaneous measurement of two test electrodes.

(2) Polarographic measurement ensures high accuracy and reproducibility.

(3) Compatible with soft, hard, hydrogel, silicone hydrogel, and other high Dk lenses.

(4) Complete system integration with host, electrode assembly, central thickness gauge, and temperature/humidity control.

(5) Precision temperature control (0.0–50.0°C) with 0.1°C resolution and ±0.2°C accuracy.

(6) Adjustable electrode excitation voltage (0.750 VDC) for polarographic measurements.

(7) Current measurement range with multiple gear options for low- and high-permeability lenses.

(8) Compact and portable design suitable for laboratory use.

Technical Parameters

Parameter	Specification
Dual Input	Supports 2 test electrodes simultaneously
Power Supply	210–250V AC, 5 W
Temperature Control	0.0–50.0°C (Resolution 0.1°C, Accuracy ±0.2°C)
Electrode Excitation Voltage	0.750 VDC
Electrode Specifications	Gold cathode Ø4 mm; Silver anode inner Ø5.75 mm, outer Ø12.75 mm
Size (W×D×H)	356 × 190 × 102 mm
Current Zero Adjustment	0–100 nA
Current Measurement Gears	19.99 nA (±10 pA), 199.9 nA (±100 pA), 1.999 μA (±1 nA), 19.99 μA (±10 nA), 199.9 μA (±100 nA)

Accessories

(1) Electrode assembly frame with two electrode slots.

(2) Gold cathode and silver anode electrodes.

(3) Central thickness gauge for accurate lens measurement.

(4) Constant temperature and humidity chamber.

(5) Calibration and adjustment tools.

(6) User manual and compliance certificates.

Test Procedures

Connect the electrodes to the dual input ports.

Place the lens sample in the electrode assembly frame.

Measure the central thickness of the lens using the thickness gauge.

Set the temperature and humidity to the desired test conditions.

Adjust the electrode excitation voltage to 0.750 VDC.

Zero the current using the current zero adjustment.

Start the polarographic measurement and record the current response.

Calculate the oxygen permeability (Dk) based on the polarographic data.

Repeat for a second sample or electrode if using dual input.

Maintenance Information

(1) Clean electrodes and assembly frame after each test to prevent contamination.

(2) Periodically calibrate the instrument using standard reference lenses.

(3) Check temperature and humidity control systems regularly for accuracy.

(4) Avoid exposure of the instrument to direct sunlight or high humidity.

(5) Replace electrodes when worn or damaged to maintain measurement precision.

(6) Store the instrument in a dry and dust-free environment when not in use.

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