javal and bl type keratometer
YZ-38 Javal Keratometers are two position ophthalmic instruments using a fixed image and doubling size
and adjustable object size to determine the radius of curvature of the reflective corneal surface
It uses two self illuminated mires, one a red square, the other a green staircase design,
which are held on a circumferential track in order to maintain a fixed distance from the eye,
in order to get repeatable, accurate measurements it is important that the instrument stays focused.  
It uses the Scheiner principle, common in auto-focus devices, in which the converging reflected rays
coming towards the eyepiece are viewed through ( at least ) two separate symmetrical apertures.
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KERATOMETERS - JAVAL AND BL TYPE
YZ-38 Javal Ophthalmometer

15X
18X


5.5 -11mm
30.0D - 60.0D
0.02mm
0.25D
1.3375
R = 5.5mm Φ1.65mm
R = 7.5mm Φ2.36mm
R = 11.0mm Φ3.36mm
0 - 180°


0 - 30mm
100mm
90mm

50mm

2x - 6V/12W Halogen bulb
AC 110/220V 50/60Hz


68 * 78 * 55cm
26Kg
38Kg









































































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bl-8000 ophthalmic instrument
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YZ-38 Javal Ophthalmometer
BL-8001
YZ-38
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BL-8001 Keratometer
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Specifications
Specifications BL-8001 & YZ-38 Keratometer

BL-8001

15X
18X


5.5 -11mm
30.0D - 61.0D
0.02mm
0.25D
1.3375
R = 5.5mm Φ1.65mm
R = 7.5mm Φ2.36mm
R = 11.0mm Φ3.36mm
0 - 180°


0 - 30mm
100mm
90mm

50mm

2x - 6V / 12W Halogen bulb
AC 110/220V 50/60Hz


68 * 76 * 52cm
25Kg
37Kg
BL-8001 Ophthalmic Keratometer is a one position ophthalmometer that gives readings in Dioptric form.
It differs from the YZ-38 because the object size is fixed, image size is the manipulable variable.
BL-8001 Keratometers can give a precise examination of the radius of curvature of the anterior corneal surface.
Measurements are performed to fit contact lenses and to monitor corneal changes produced through
the wear of contact lenses.
The keratometers are occasionally used to assist to recognize certain corneal abnormalities
and to check the radii of curvature of both hard and soft contact lenses.
BL-8001 keratometer is an easy to use ophthalmic instrument, supplied with table plate or electric table.
Ophthalmic instruments - Keratometers
Model Type

● Magnification of Eyepieces
● Total Magnification

Measurement Range
- Radius of Curvature
- Diopter
- Reading Increment
- Measuring Accuracy
- Refractive Index used for compensation
- Minimum Surface required for measurement


- Angle Measuring Disc

● Moving Slipway
- Range Slipway Up/Down
- Left & Right
- Front and back

Moving Range Chin-rest

Illumination
Power

Packing Weight & Size
- Dimensions
- Gross Weight ( with table plate )
- Gross Weight with electric table
BL-8001
Restore Sight
yz-38 javal
YZ-38