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The Jackson cross-cylinder is an optical instrument used in ophthalmology and optometry to refine the correction of astigmatism during a subjective refraction examination.
It consists of two cylindrical powers of opposite signs, arranged along perpendicular axes.
What is it used for?
- To refine the axis of astigmatism in order to determine its orientation precisely.
- To determine the optimal cylindrical power required to correct astigmatism.
- To compare two optical corrections by quickly rotating the cylinder in front of the patient’s eye.
- To optimize visual quality when prescribing glasses or contact lenses.
Technical Specifications
English Name: Jackson Cross Cylinder (JCC)
Type: Subjective refraction instrument
Common powers: ±0.25 D and ±0.50 D
Other powers: ±0.75 D and ±1.00 D depending on the model
Construction: Two cylinders with opposite powers
Axes: Perpendicular (90°)
Markings: Red and white dots
Handling: Rotation and flipping of the lens
Use: Manual refraction or with a refractor
Principle of Operation
The practitioner places the cross cylinder in front of the patient’s eye and presents two positions in succession by flipping the instrument.
The patient indicates in which position the characters appear sharpest. The patient’s responses allow the practitioner to gradually adjust the axis and then the cylindrical power.
In summary: the Jackson cross-cylinder is an essential accessory for subjective refraction, enabling the precise determination of the correction for astigmatism.
Checked by OPHTAZON
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Year of mfg.
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Checked by OPHTAZON
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Year of mfg.
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Available
Checked by OPHTAZON
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Year of mfg.
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Available
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