Recently, I replaced my 1.61 index lens with 1.67 and the prescription is the same. But after that, I felt some strain in my eyes. Is this a lens quality issue? - Quora
![1.49 1.50 1.56 1.61 1.67 Free Form Progressive Lens Rx Freeform Ophthalmic Lenses - Buy Progressive Lens,Freeform Progressive Lens,Free Form Progressive Lens Product on Alibaba.com 1.49 1.50 1.56 1.61 1.67 Free Form Progressive Lens Rx Freeform Ophthalmic Lenses - Buy Progressive Lens,Freeform Progressive Lens,Free Form Progressive Lens Product on Alibaba.com](https://img.alicdn.com/imgextra/i2/6000000006649/O1CN01leUep41yzHw56Fl9K_!!6000000006649-0-tbvideo.jpg)
1.49 1.50 1.56 1.61 1.67 Free Form Progressive Lens Rx Freeform Ophthalmic Lenses - Buy Progressive Lens,Freeform Progressive Lens,Free Form Progressive Lens Product on Alibaba.com
![Glasses Resin Semi Finished Lens Blanks Single Vision 1.61 Index MR-8 Monomer - Buy optical lens blanks, semi finished optical lens blanks, 1.61 Semi Finished Lens Product on Jiangsu Aogang Optical Glasses Co., Ltd. Glasses Resin Semi Finished Lens Blanks Single Vision 1.61 Index MR-8 Monomer - Buy optical lens blanks, semi finished optical lens blanks, 1.61 Semi Finished Lens Product on Jiangsu Aogang Optical Glasses Co., Ltd.](https://5jrorwxhkqjirij.ldycdn.com/cloud/ijBqkKkqRilSjqkrmrko/SF-1-61-HMC.jpg)
Glasses Resin Semi Finished Lens Blanks Single Vision 1.61 Index MR-8 Monomer - Buy optical lens blanks, semi finished optical lens blanks, 1.61 Semi Finished Lens Product on Jiangsu Aogang Optical Glasses Co., Ltd.
![Cr39 1.49 1.56 1.59 1.61 1.67 1.70 1.74 Single Vision Hc Hmc EMI UV Optical Lens - China Danyang Lens and China Optical Lens Cr39 1.49 1.56 1.59 1.61 1.67 1.70 1.74 Single Vision Hc Hmc EMI UV Optical Lens - China Danyang Lens and China Optical Lens](https://image.made-in-china.com/43f34j00NcBfZyshQVob/Cr39-1-49-1-56-1-59-1-61-1-67-1-70-1-74-Single-Vision-Hc-Hmc-EMI-UV-Optical-Lens.jpg)
Cr39 1.49 1.56 1.59 1.61 1.67 1.70 1.74 Single Vision Hc Hmc EMI UV Optical Lens - China Danyang Lens and China Optical Lens
![1.56 1.61 1.67 1.74 optical lenses progressive Myopia Hyperopia anti-blue ray lens CR-39 aspheric eyeglass lenses MR-8 - AliExpress 1.56 1.61 1.67 1.74 optical lenses progressive Myopia Hyperopia anti-blue ray lens CR-39 aspheric eyeglass lenses MR-8 - AliExpress](https://ae01.alicdn.com/kf/He2f8846cf0824206bc087754046229a8w/1-56-1-61-1-67-1-74-optical-lenses-progressive-Myopia-Hyperopia-anti-blue-ray.jpg_.webp)