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Staring at your eyeglass prescription can feel like deciphering a secret code. OD, OS, SPH, CYL—what does it all mean? You're not alone. Understanding this document is the first step to clear vision, but the real magic happens when you pair that precise prescription with eyewear designed for your modern life.

This guide will clearly explain every term on your script and show you how at DOLLGER, we translate that medical precision into seamless, daily visual freedom.

Lesson 1: OD, OS, OU – Your Eyes' Secret Codes

Let's start with the most common terms. They're simply Latin abbreviations eye doctors use to specify which eye.

• OD (Oculus Dexter): This is your right eye.

• OS (Oculus Sinister): This is your left eye.

• OU (Oculus Uterque): This means both eyes.

Pro Tip: Remember "D" for the "right" eye (both have an "R"? It helps!), and "S" for "sinister" or "left."

Lesson 2: Your Prescription Decoded – The Core Terms

These numbers describe the lens power needed to correct your vision.

• SPH (Sphere) – The Main Power
  This number (measured in diopters, D) corrects nearsightedness (a minus sign, like -2.00) or farsightedness (a plus sign, like +1.50).

• CYL (Cylinder) & Axis – The Astigmatism Team
  If your eye is shaped more like a football than a basketball, you'll see these.

• CYL: The power to correct astigmatism. It can be a plus or minus number.

• Axis (1 to 180): Like a map coordinate, it tells where that correction needs to be placed on the lens.

• Add (Addition) – The Reading Boost
  A positive power (e.g., +1.25) added to multifocal lenses (bifocals or progressives) for presbyopia—the age-related loss of near vision.

• PD (Pupillary Distance) – The Key to Comfort
  The distance (in millimeters) between your pupils. A correct PD ensures the optical center of your lenses aligns perfectly with your eyes, which is crucial for clear, strain-free vision.

CRITICAL NOTE: Your Glasses Prescription ≠ Your Contact Lens Prescription

You cannot use your eyeglass prescription to order contacts. Contact lenses require a separate fitting to measure parameters like base curve and diameter for safety and eye health.

From Prescription to Wear: Why Precision Matters More Than You Think

A precise prescription is vital, but its full potential is only unlocked when paired with a frame engineered for optical accuracy. This is the core of the DOLLGER design philosophy.

• For High Prescriptions & Astigmatism (SPH/CYL): The optical center must be stable. DOLLGER base frames are manufactured for precise lens alignment, preventing visual fatigue caused by poor positioning.

• For Progressive Lens Wearers (Add Value): Different vision zones must remain perfectly usable. DOLLGER's magnetic attachment is calculated to never interfere with your progressive channels, allowing seamless switching from reading to computer use to outdoor glare protection.

• For Everyone – The PD Imperative: We provide guides to help you measure your PD accurately, ensuring every DOLLGER system is personalized for maximum visual clarity.

Conclusion: Knowledge is Power. Now, Choose Freedom.

You now speak the language of your prescription. This knowledge empowers you to choose eyewear that doesn't just correct vision but adapts to your life.

DOLLGER merges optical precision with intelligent design. One base frame holds your custom prescription. Then, a simple magnetic click adds polarized sunglasses, blue light filtration, or a new style. No more carrying multiple pairs or waiting for transitions.

Ready to see what your prescription can really do?
👉 [Explore the DOLLGER Magnetic Eyewear System Tailored to Your Script]