No, SPH does not automatically mean 0. SPH stands for Sphere, and it represents the amount of lens power, measured in diopters (D), needed to correct nearsightedness (myopia) or farsightedness (hyperopia). An SPH value of 0.00, Plano (Pl), or an infinity sign indicates that no spherical correction is needed.
Here's a breakdown:
- SPH (Sphere): Indicates the lens power required to correct vision. It's the diopter value.
- Positive SPH Values (+): Indicate farsightedness (hyperopia).
- Negative SPH Values (-): Indicate nearsightedness (myopia).
- SPH Value of 0.00 (or Plano/Pl): Means no correction is needed for nearsightedness or farsightedness. Your distance vision is considered normal. An infinity sign sometimes symbolizes this as well.
In summary, the SPH value in your eyeglass prescription describes the spherical correction needed. If that value is zero, it means no spherical correction is necessary.
