The practitioner or technician should be at eye level and about arm’s length away from the patient.
#Pupil chart windows#
When using the Volk Eye Check, try to avoid bright light from windows or mirror reflections that could influence the pupil size. The Volk Eye Check is an ocular measurement device that allows eye-care professionals to obtain repeatable and reliable pupil size measurements. If you are interested in receiving a SpecialEyes Pupil Diameter Ruler, please contact the SpecialEyes Team.
For optimal accuracy, take the measurement at the patient’s eye level and repeat each measurement two or three times to ensure the result is consistent. Have the patient focus straight ahead at an intermediate range spot to avoid accommodation.
Begin by placing the ruler as close as possible alongside the eye, making certain not to tilt or bend the device. However, using these tools requires special care to ensure the measurement is accurate. If you have any questions about designing a custom multifocal contact lens using a pupil size measurement from a corneal topographer, please contact our consultation department.Ī ruler or pupil gauge offers an inexpensive and simple method to obtain pupil size measurements. Conversely, if the same patient were measured in a dimly lit setting, the pupils will dilate and produce a larger measurement. For example, when using the Medmont device in a brightly lit setting, the patient’s pupil will be more constricted and result in a smaller reading. On the other hand, the Medmont Topographer uses an infrared light source that should not influence pupil size so in this case, the room lighting during the capture will be the primary variable. Therefore, when designing the multifocal optic zones based on this device’s measurements, we would need to assume a certain amount of dilation for an effective pupil size in regular room illumination. The resulting pupil measurement will be smaller than it would be in regular room illumination. When using measurements obtained with a corneal topographer, it is crucial to account for the lighting of the room during the capture as well as the type of topographer, since some topographers use a light source that impacts the pupil size.Īs an example, the Oculus Keratograph 5M Topographer emits a bright white light that will cause the pupil to constrict. SpecialEyes designs the 54 Multifocal optic zones based on the patient’s pupil size in regular room illumination.
#Pupil chart manual#
Please refer to your topographer’s user manual for specific details and instructions. Most corneal topographers will automatically capture the patient’s pupil size.
The pupil measurement is listed under “Attributes” and outlined in red. Topography results from a Medmont Topographer. 1mm–.5mm) for the initial lens design greatly increases your patient’s chance of success, so we have listed some tools and tips below to help you achieve the best possible results. Providing an accurate pupil size measurement (within. SpecialEyes recommends designing the multifocal optic zone sizes based on a patient’s effective pupil size measurement in regular room illumination, unless the patient’s work or preferences call for optimal vision in a different lighting condition. The multifocal optic zones are designed to provide a good balance of vision within the setting the patient would most frequently wear the lenses.
#Pupil chart simulator#
The SpecialEyes Multifocal Simulator uses this measurement to ensure appropriate distribution of the custom multifocal optics over the pupil. 1mm–.5mm) for the initial lens design greatly increases your patient’s chance of success, so we have listed some tools and tips below to help you achieve the best possible results.īefore fitting the 54 Multifocal contact lens, SpecialEyes strongly advises eye-care professionals to accurately measure the patient’s pupil size.
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