Begin reading the row for the left eye (OS), starting under Sphere, which is the same prescription as the right (-5.50). Therefore, both eyes have the same level of nearsightedness accounted for in the prescription. Next, we check the Cylinder (CYL) column, which shows -0.50 of astigma...
CYL = Cylinder, which represents the amount of lens power you need to correct for astigmatism, a condition where the cornea is irregularly shaped (like a football [oval] instead of a basketball [spherical]), causing blurring or distorted vision at any distance. Astigmatism is a common condition...
Now that you understand those mysterious letters and numbers, you know how to read a glasses prescription! Knowing what they mean will also help you more easily discuss your prescription with your eye care professional. Shop eyeglassesShop prescription sunglasses...
Theaddvalue — short for added magnifying power — relates to the bottom lens in multifocal glasses. Unlike sphere and cylinder, this is always a positive number (even if it isn’t always preceded by a plus sign). The higher theaddnumber, the more powerful the bottom lens is. PD PD sta...
RXSphereCylinderAxisPrismAdd* OD-2.50-0.75180 OS-3.00-1.00180 PD: 58 Looking at your prescription for eyeglasses, you will see two headings labelled OD:Latinoculus dexter, meaning “right eye" OS:Latinoculus sinister, meaning “left eye” ...
If the prescription had been for a hypermetrope, then the ocular cylinder would have been greater than the spectacle cylinder, as predicted by the steeper curve in Fig. 7.2. Vertex distance tables using this calculation are given in Appendix A at the end of this book, while the spherical ...
EyeQue calculates the user's refractive error in that particular direction. The device then rotates the lines to another angle and you repeat the measurement. Measuring the refractive power over a number of different angles gives the sphere, cylinder, and axis needed to correct your vision with ...
what does sphere mean under cylinder for glasses252VOL: 20$--t does the cylinder on glasses eman197VOL: --$--glasses cylinder meaning73VOL: 100$--cylinder eye prescription meaning48VOL: 310$2.47pendleton eye center14VOL: 80$--71 其他檢視更多 ...
As one of the advantages of the glasses-type platform, this device can transform the lens required by the user, such as sunglasses for the UV protection [31,118,119], or prescription lenses for eyesight. As shown in Figure 5d, details on electrodes for recording biopotential signals such as...