The binocular harmonization technology reduces prismatic side effects from each eye which leads to a more balanced experience while reading with progressive lenses. The higher the difference is in lens power in the left and in the right eye the more side effects the wearer will have. The image from the right eye gets deviated in comparison to the left eye.
The binocular harmonization technology takes that information into consideration and changes the progressive corridor lengths for each eye to ensures both eyes have similar reading support when looking down. This technology is available with high-end progressive lenses from Hoya.
Some wearers of progressive lenses really stick to this brand when buying progressive lenses so I wanted to compare the hoya lenses with the Binocular Harmonization Technology with a pair of progressive lenses without the Binocular Harmonization Technology. In this case, I ordered the Eden Zeta lenses from Novacel for comparison.
The Binocular Harmonization Technology can only work when the prescription is different in the left and in the right eye. So I ordered both progressive lenses with a difference of two diopters between the eyes. A bigger difference than that will probably require the wearer to get a slab off to minimize the side effects. Those side effects are:
- Vertigo when wearing progressives
- When you can only read with one eye at a time
- Headaches
Reference:
- progressive-glasses.com/what-is-binocular-harmonization-technology-does-it-work
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