Many people with myopia report that their two eyes have different, sometimes significant, diopters. What lenses are best for this situation?
This common abnormal refractive condition caused by the difference in refractive power between the two eyes is called anisometropia, typically defined as a spherical equivalent difference of >1.00 D between the two eyes.
Anisometropia is one of the main causes of anisotropia. Both anisometropia itself and its correction can contribute to anisotropia.
Therefore, in this case, we recommend using anisometropia lenses.
What are equirectangular lenses?
Equirectangular lenses are specifically designed to correct the imbalance in binocular vision seen by patients with anisometropia. They are widely referred to as equivalent lenses or afocal lenses.
By adjusting the lens' thickness, front surface curvature, refractive index, and eye-to-eye distance, the magnification of the image of an object through the lens can be altered.
Equirectangular lenses not only provide the required light intensity for each eye, but also ensure that the image size seen by the left and right eyes is equal, or approximately equal.
Who are suitable for isotropia lenses?
Isotropia lenses are primarily suitable for people with binocular vision discrepancies, or imbalanced vision.
For example, isotropia lenses can effectively improve vision problems in children, adolescents, and adults with binocular vision discrepancies caused by myopia, hyperopia, or astigmatism.
When the anisotropic ratio reaches 3.5% or above, the eyes begin to feel varying degrees of discomfort. Although it can be adapted to and overcome, it will also aggravate a series of adverse phenomena such as visual fatigue, difficulty in eye movement, general fatigue, spatial dislocation, etc.
What are the functional advantages of isotropic lenses?
[Isotropic lenses] are specially designed optical lenses with four main functional advantages:
01 Precision Correction
Through precise optical design, isotropic lenses can effectively correct binocular image imbalance, helping users achieve a clearer visual experience.
02 Reduce Eyestrain
By correcting binocular image imbalance, isotropic lenses can reduce fusion difficulties and effectively control prismatic effects, reducing eye muscle fatigue.
03 Improve Binocular Coordination and Visual Function
For users with impaired binocular coordination, isotropic lenses are particularly important, helping to improve binocular coordination and visual function.
04 Wearing Comfort
Through optimized parameters and high-refractive index materials, isotropic lenses achieve a light and natural wearing experience while enhancing visual comfort.
What are the requirements for fitting isopectoral lenses?
When fitting isopectoral lenses, there are three parameters to consider:
NO.1 Professional Parameters
If the lens store has professional anisotropia testing methods, they can measure the exact anisotropia ratio.
NO.2 Necessary Parameters
The parameters that must be measured include: spherical lens, cylindrical lens, axial position, and interocular distance. It is particularly important to note that interocular distance is directly related to the magnification of the isopectoral lens and must be measured accurately.
NO.3 In-store Fitting Parameters
① Measure the monocular pupil height and monocular pupil distance: This ensures the accuracy of the optical center and a clear image.
② Measure the anteroposterior tilt angle: The normal range for the anteroposterior tilt angle is 8° to 15°, which accurately measures the near vision zone and ensures comfortable close vision.
③ Measure the mirror angle: The normal range for the mirror angle is 170° to 180°, ensuring a close fit to the face, a wide field of view, and reduced prismatic effect.
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Post time: Aug-29-2025