Essilor Instruments Vision-R 800, Руководство пользователя

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• On the console keyboard, by turning the central button anticlockwise * .
> Start the test again until you obtain the equal blackness for the characters on the red background
and the green background or you achieve the preference for the red background.
- identical on the red background and the green background retain this sphere value.
In the event of preferred red and green inversion between two sphere steps, retain the last values:
• " red “ for a patient with myopia
• " green “ for a patient with hypermetropia
Notes
• To avoid the disturbing effects of the accommodation of the patient (which can make him prefer the
red), it is possible to:
◦ ask the patient to lock on the green background before proceeding to the red/green comparison,
◦ lightly scramble by adding a power of +0.50 R in order to obtain a preference for the red and to
then clear it up until obtaining the balance between the red and the green.
• Several successive preferred answers for the red can indicate that the patient unintentionally involves
his accommodation.
This can occur in particular with young patients who can be sometimes appear short-sighted by the
excessive inclusion of their accommodation. It is thus important to make sure not to let it result in a
too concave (or negative) sphere value.
*
This information corresponds to the phoropter default settings:
• The variation step of the sphere is by default 025 R, but it can be adjusted in the settings.
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Vision-R 800 - Essilor automatic phoropter > V1 - 12-2018
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SER MANUAL
> IV. P
ERFORMANCE OF SPECIFIC TESTS DURING A REFRACTION EXAMINATION