What does OS and od mean for contact lenses?

What Does OS and OD Mean for Contact Lenses?

Understanding the Acronyms

Contact lenses are a common type of eye care product that can help people with certain eye conditions or imperfections. In the contact lens world, two acronyms play a crucial role in determining the type of contact lenses you wear: OS and OD.

OS stands for Optic Surface

• What is Optic Surface?:
  Optic surface refers to the part of the eye where light enters. In contact lenses, the optic surface is the clear area on the front of the lens where light passes through.
• What does it mean for contact lenses?:
  For contact lenses, the optic surface is the area where the contact lens rests on the eye. It’s essential to choose a contact lens that has a smooth, rounded surface to prevent irritation, discomfort, or even infections.
• Types of Optic Surfaces:
  There are two main types of optic surfaces:

  • Straight: the contact lens lies flat on the eye
  • Curved: the contact lens follows the shape of the eye

OD stands for Optic Dominance

• What is Optic Dominance?:
  Optic dominance refers to the area of the eye where the light is more sensitive. In contact lenses, optic dominance affects how the contact lens is positioned on the eye.
• What does it mean for contact lenses?:
  For contact lenses, optic dominance is crucial in determining the correct position of the lens on the eye. If the optic surface is flat or curved, it can affect the way the contact lens sits on the eye.
• Types of Optic Dominance:
  There are two main types of optic dominance:

  • Spontaneous: the contact lens sits on the cornea (the clear front surface of the eye)
  • Centration: the contact lens is centered on the eye, rather than sitting flat on the cornea

When to Use OS or OD

• When to use OS (Optic Surface):
  You should use an OS contact lens if you have a straight optic surface. This means your contact lens will lie flat on the eye, and you’ll need to add a ring or preservative to your contact lens case to prevent eye infections.
• When to use OD (Optic Dominance):
  You should use an OD contact lens if you have a curved optic surface. This means your contact lens will follow the shape of the eye, and you’ll need to adjust the way you place it on your eye to prevent discomfort or irritation.

Choosing the Right Type of Contact Lens

• Consider your eye shape and size:
• Think about your prescription:
• Consider the type of contact lens:

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    • Water-soluble

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    • Water-ingredient

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    • Silicone hydrogel

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    • Tear-free

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    • Anti-fog

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    • Self-occurring

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    • Self-occurring

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    • Remember to choose the right materials and styles:

  Type of Contact Lens	Materials	Benefits
  Water-soluble	Water-based	Flexible, breathable, and easy to clean
  Water-ingredient	Water-based	Easy to wear, gentle on the eye
  Silicone hydrogel	Silicone	Moisturizes the eye, retains oxygen
  Tear-free	Special formula	Carefree from tears and irritation
  Anti-fog	Special formula	Reduces fogging and maintains clear vision
  Self-occurring	No ring	No ring needed, adjustable as needed
  Self-occurring	No ring	No ring needed, adjustable as needed

  What to Do When You Experience Eye Irritation

  • If you experience eye irritation:

    • *
      • Flush your eyes with artificial tears

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      • Remove contact lenses and wash with saline solution

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      • See an eye doctor for guidance
      • If you experience eye pain or discomfort:
      • *
        • See an eye doctor immediately

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        • Use over-the-counter pain relievers or anti-inflammatory drops

        *

        • Avoid rubbing your eyes
        • If you experience severe eye symptoms:
        • *
          • See an eye doctor immediately

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          • Seek emergency medical attention

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          • Don’t hesitate to contact a telemedicine service or online consultation

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