Many myopic people report that the diopter of their two eyes is different, or even very different. In this case, what kind of lens should be chosen?
This common abnormal refractive state caused by different diopter of both eyes is called anisometropia, which is usually defined as the difference of the equivalent spherical lens of both eyes>1.00D.
Anisometropia is one of the main causes of unequal images of both eyes. Both anisometropia itself and its correction may cause unequal images of both eyes.
Therefore, at this time, we recommend the use of [equi-image lenses] first.
What is an isochromatic lens?
An isochromatic lens is a lens specially designed to correct the unbalanced image of the two eyes in patients with anisometropia. It is widely known as an equivalent lens or an afocal lens.
By adjusting the thickness, front surface curvature, refractive index and lens-eye distance of the lens, the magnification of the image of the object through the lens in the eye can be changed.
An isochromatic lens can not only provide the required light for each eye, but also make the image size seen by the left and right eyes equal, or nearly equal.
Isochromatic lenses are mainly suitable for people with binocular anisometropia and binocular imaging imbalance.
For example: children, adolescents and adults with binocular vision differences due to myopia, hyperopia or astigmatism, isochromatic lenses can effectively improve their vision problems.
What are the functional advantages of isochromatic lenses?
[Isochromatic lenses] are specially designed optical lenses with four main functional advantages:
01 Precise correction Through precise optical design, isochromatic lenses can effectively correct the imbalance of binocular imaging and help users get a clearer visual experience.
02 Reduce visual fatigue By correcting binocular imaging, isochromatic lenses can reduce the difficulty of fusion, and at the same time can effectively control the prism effect difference and reduce eye muscle fatigue.
03 Improve binocular coordination and visual function For users with reduced binocular coordination ability, isochromatic lenses are particularly important and can help improve binocular coordination ability and visual function.
04 Wearing comfort By adjusting parameters and high-refractive materials, isochromatic lenses can achieve a light and natural wearing experience while improving visual comfort.
What are the fitting requirements for isotropia lenses?
When fitting isotropia lenses, there are three parameters to pay attention to:
NO.1 Professional parameters If the store has a professional method for checking unequal images, it can measure the precise ratio of unequal images.
NO.2 Necessary parameters The parameters that must be measured are: spherical lens, cylindrical lens, axial position and lens-eye distance. It is particularly important to note that the lens-eye distance is directly related to the magnification of the isotropia lens, and it must be measured accurately.
NO.3 Store assembly parameters
① Measure the monocular pupil height and monocular pupil distance: ensure the accuracy of the optical center and clear imaging.
② Measure the anteversion angle: The normal range of the anteversion angle is 8°~15°, accurately measuring the near use area and making near vision more comfortable.
③ Measure the mirror angle: The normal range of the mirror angle is 170°~180°, which fits the face, ensures a wide field of vision, and reduces the prism effect.
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Post time: Apr-25-2025