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CAUTION

• Information on the avoidance of overexposure to potentially hazardous optical

radiation (ISO 15004: 1997)

Spectrally weighted photochemical radiances L

and L

give a measure of the potential

that exists for a beam of light to cause photochemical hazard to the retina. L

gives the

measure for eyes in which the crystalline lens is in place. L

gives this measure either

for eyes in which the crystalline lens has been removed (aphakes) and has not been

replaced by a UV-blocking lens or for the eyes of very young children.

The value stated for this ophthalmic device gives a measure of hazard potential when

the device is operated at maximum intensity and maximum aperture. The values of L

or L

for the TONOREF II are sufficiently low as shown on the following page.

The retinal exposure dose for a photochemical hazard is a product of the radiance and

the exposure time. For instance, at a radiance level of 0.5 mW/(cm

zsr), 480 min irradi-

ation of the dilated (8 mm diameter) pupil would cause the retinal exposure dose level to

attain the recommended exposure limit. If the value of radiance were reduced to 0.1

mW/(cm

zsr), five times that time (i.e. 2400 min) would be needed to reach the recom-

mended limit. The recommended exposure dose is based on calculations arising from

the American Conference of Governmental Industrial Hygienists (ACGIH) - Threshold

Limit Values for Chemical Substances and Physical Agents (1995 - 1996 edition).

The following page shows the graph of spectrum output for the TONOREF II. Patients will

be at low risk of acute optical radiation with the TONOREF II. However, it is recommended

that the intensity of light directed into the patient’s eye be limited to the minimum level

which is necessary for diagnosis. The total of the retinal exposure dose must be carefully

watched for infants, aphakes and persons with diseased eyes who are at greater risk

when other ophthalmic devices with a high level of radiance are used in conjunction.

• Spectrum output of all light source during AR/KM measurement (maximum light intensity)

* The wavelength 1000 to 1100 is calculated and plotted according to the wavelength charac-

teristic data of the infrared LED used.

• Spectrum irradiance

: Spectrally weighted photochemical aphakic source radiance

: Spectrally weighted photochemical phakic source radiance

Irradiance (μW/cm

)

Wavelength (nm)

(mW/cm

/sr) 305 - 700 nm

0.0027

(mW/cm

/sr) 380 - 700 nm

0.0003

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 143 144

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