For plus-power lens, deeper curve made on the near-vision area minimizes distortion shallow curve adjusts the far-vision area. With this, a good balance between far and near vision has been achieved.
(The opposite is made for the minus-power lens.)
![](https://www.tokaiopt.com/en/product/wp-content/uploads/sites/3/2023/07/image-2.jpeg)
For plus-power lens, deeper curve made on the near-vision area minimizes distortion shallow curve adjusts the far-vision area. With this, a good balance between far and near vision has been achieved.
(The opposite is made for the minus-power lens.)