What we need is, in contact lens products, that we have two different variables that yield 2 SKUs in the same product. For example: The product is Acuvue Oasys, for the left eye it is +2.00 (SKU 334256) with 2 units and for the right eye it is +3.50 (SKU 432345) with 2 units.
As shown in the screenshots, we have the options on our current page. The customer can choose if he has the same graduation for both eyes, indicates 1 single graduation and the quantity. If he has 2 graduations, he indicates 1 for the left eye and the quantity, another for the right eye and the quantity.
In spherical contact lenses, such as those mentioned, it is 1 SKU per graduation. In the case of contact lenses for astigmatism, it is 1 SKU per combination of 3 variables: spherical, cylinder, and shaft. Example of this case: A customer enters for the left eye ESF -2.50, CIL -0.75, EJE 120 (SKU 243312) and 2 units. For right eye ESF -1.75, CIL -1.25, EJE 180 (SKU 354344) and 2 units.
Sometimes the amount can vary and is not always the same for both eyes, they choose 3 units for the left eye and 1 unit for the right eye, so the amounts go for each eye.