Symmetra™ – Aniseikonia Balancing
Many patients report symptoms such as headaches, visual fatigue, light sensitivity, double vision, nausea, or difficulty reading—yet these concerns are not always explained by their prescription or by obvious binocular misalignments. Beyond refractive error and traditional phorias, differences in retinal image size between the eyes—known as aniseikonia—can play a significant and often unnoticed role in visual discomfort.
Aniseikonia arises when differing prescriptions between the two eyes (anisometropia) cause each eye to form a retinal image of a different size. Even small mismatches—sometimes as little as 1% can interfere with binocular fusion and lead to significant visual discomfort
This is most prominent when patients exhibit:
1.00D or higher Anisometropia
Post-surgy Intraocular Lens Asymmetry
Long-term Prescription Imbalance
Limited Prismatic Symptom Improvement
Symmetra™ from Lens Shapers is designed specifically to address this problem. By managing both image-size variation and subtle prismatic imbalances, these lenses give optometrists a scientific, customised option for patients struggling with persistent binocular symptoms.
Shape Factor Adjustments:
Curvature manipulation (Base curve)
Power Factor Adjustments:
Modifications to lens thickness and index
Optometrists are uniquely positioned to identify and treat the nuanced interactions of image size, eye alignment, and binocular integration. Riverside’s specialty lenses align with core optometric principles— preserving binocularity, preventing decompensation, and enhancing quality of life for symptomatic patients.
- Full customization for image size and prism correctio4
- Potential to reduce need for slab-off or bicentric grin!
- Support for complex anisometropic or post-surgical case:
- Cosmetic balancing techniques to enhance patient satisfactio4
- Direct consultation with Riverside’s technical team for feasibility and design
