PERKINS TONOMETER Instructions for Use Quick Guide Issue 1 March 2015

Instructions for use

Federal law notice: Federal law restricts this device to sale by or on the order of a physician or practitioner.

The light is switched on by turning the thumb-wheel above zero. Adjust the force by turning the thumb-wheel until the inner margins of the semi-circles coincide.

Warning! – Only to be conducted by qualified and trained personnel.

The Perkins tonometer should be held so that the thumb rests on the milled wheel. Please read the instructions before using the equipment.

The light is switched on by turning the thumb-wheel until the scale reading is just above zero. If the forehead rest is to be used, the stem should be extended after loosening the locking screw. It is usually easier to hold the tonometer obliquely with the handle slanted away from the nose. Care should be taken to prevent the prism touching the eyelid margin.

Charging The battery indicator displays fully-charged (green) or the battery needs charging (red).

Instruct the patient to look straight ahead or slightly upward and, if necessary, use a fixation target. CHARGING

Calibration

PATIENT USE

Place a fluorescein paper strip near the external canthus in the lower conjunctival sac. After a few seconds the lacrimal fluid is sufficiently coloured and the paper can be removed.

For a rough calibration, adjust the thumb-wheel to a line’s width from the two mark, place the control weight on the prism tip and check the cone arm carries downwards. Also, set the scale above the two mark and check the prism and weight remain at their highest position.

It is recommended that patients are repeatedly asked to keep their eyes wide open during the examination. If required, the lids of the examined eye may be held open by the examiner’s fingers, provided that no pressure is applied to the eye.

Goldmann-compatible

Correct position

The Perkins applanation tonometer functions according to the “Goldmann” method; the measuring of the pressure required to maintain a uniform applanation of the surface of the cornea.

The inner edges of the fluorescein rings touch each other. The reading multiplied by ten gives the ocular pressure in mm Hg. CALIBRATION

The prism can be pushed into the prism holder. Tonosafe disposable prisms are recommended, these are supplied fully-sterile to help eliminate the risk of cross-infection.

Adjust the force by turning the thumb-wheel until the inner margins of the semi-circles coincide. The tonometer is removed from the eye and the reading noted. The large divisions of the scale represent 0.2 grams.

APPLANATION

The reading is multiplied by ten to give the tension in millimetres of mercury (mm Hg). Readings should be repeated until a steady value is obtained.

Anaesthetic and fluorescein must be instilled prior to testing.

INSERTING TONOSAFE

02 |

Both eyes must always be anaesthetised (e.g. 2-3 drops each of an anaesthetic within half a minute) to reduce movements of the lids during examination.

This quick guide and the full Perkins instruction for use can be found at: www.haagstreituk.com/ifu

CORRECT MEASURING POSITION

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Instructions for use

Federal law notice: Federal law restricts this device to sale by or on the order of a physician or practitioner.

The light is switched on by turning the thumb-wheel above zero. Adjust the force by turning the thumb-wheel until the inner margins of the semi-circles coincide.

Warning! – Only to be conducted by qualified and trained personnel.

The Perkins tonometer should be held so that the thumb rests on the milled wheel. Please read the instructions before using the equipment.

The light is switched on by turning the thumb-wheel until the scale reading is just above zero. If the forehead rest is to be used, the stem should be extended after loosening the locking screw. It is usually easier to hold the tonometer obliquely with the handle slanted away from the nose. Care should be taken to prevent the prism touching the eyelid margin.

Charging The battery indicator displays fully-charged (green) or the battery needs charging (red).

Instruct the patient to look straight ahead or slightly upward and, if necessary, use a fixation target. CHARGING

Calibration

PATIENT USE

Place a fluorescein paper strip near the external canthus in the lower conjunctival sac. After a few seconds the lacrimal fluid is sufficiently coloured and the paper can be removed.

For a rough calibration, adjust the thumb-wheel to a line’s width from the two mark, place the control weight on the prism tip and check the cone arm carries downwards. Also, set the scale above the two mark and check the prism and weight remain at their highest position.

It is recommended that patients are repeatedly asked to keep their eyes wide open during the examination. If required, the lids of the examined eye may be held open by the examiner’s fingers, provided that no pressure is applied to the eye.

Goldmann-compatible

Correct position

The Perkins applanation tonometer functions according to the “Goldmann” method; the measuring of the pressure required to maintain a uniform applanation of the surface of the cornea.

The inner edges of the fluorescein rings touch each other. The reading multiplied by ten gives the ocular pressure in mm Hg. CALIBRATION

The prism can be pushed into the prism holder. Tonosafe disposable prisms are recommended, these are supplied fully-sterile to help eliminate the risk of cross-infection.

Adjust the force by turning the thumb-wheel until the inner margins of the semi-circles coincide. The tonometer is removed from the eye and the reading noted. The large divisions of the scale represent 0.2 grams.

APPLANATION

The reading is multiplied by ten to give the tension in millimetres of mercury (mm Hg). Readings should be repeated until a steady value is obtained.

Anaesthetic and fluorescein must be instilled prior to testing.

INSERTING TONOSAFE

02 |

Both eyes must always be anaesthetised (e.g. 2-3 drops each of an anaesthetic within half a minute) to reduce movements of the lids during examination.

This quick guide and the full Perkins instruction for use can be found at: www.haagstreituk.com/ifu

CORRECT MEASURING POSITION

| 03

Cleaning methods Manual cleaning methods appropriate for non-immersable, opto-electronic devices should be used. External components that come into contact with intact skin and do not come into contact with the patient, should be wiped with a clean, non absorbent cloth and detergent solution or isopropyl alcohol 70%.

Technical Specification Specifications

Environmental conditions

Regulatory

Part numbers

Measurement range

0-50 mmHg (0 – 66.5 kPa)

Standard divergence

0.49 mN

Reverse span

=/< 0.49 mN

Weight

1.0 kg (Packed)

Light source

LED 450 – 490nm

Power supply

3.6V NiMh battery

Temperature

-10 to +35 C

Humidity

30% to 90%

Atmospheric pressure

800 to 1060 hPa

Classification

CE Class IIa

Standards

MDD 93/42/EEC ISO 8612:2009 ISO 15004-1:2006 EN60601-1 EN60825-1

Perkins tonometer (UK) Perkins tonometer with Tonosafe Perkins tonometer (EU) Perkins tonometer (AUS)

5806000A 5806001A 5806001B 5806004

PERKINS TONOMETER Instructions For Use (IFU) Quick Guide

HAAG-STREIT UK Edinburgh Way Harlow Essex CM20 2TT Phone (01279) 881974 [email protected] www.haagstreituk.com/ifu

0120

©HAAG-STREIT UK 2015 E & OE. 1902547/ISSUE 1/March 2015