19_add-on Step 4 (Bifocals Types)
- Regular price
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£47.63 GBP - Regular price
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- Sale price
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£47.63 GBP
Essential Information
Product Type:
Frame Size (eye-nose-side in mm):
Frame Shape:
RX Able:
Colour:
Detail Description
FRAME SIZE
Dimensions (eye-nose-side in mm):
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Welcome to Ottika's comprehensive guide on how to read your eyewear prescription. Understanding the numbers and symbols on your prescription is the key to achieving clear vision. Let's break down the essential elements:
Contact Lenses
Eyeglasses
1. Sphere (SPH):
- Indicates the main lens power to correct nearsightedness (negative values) or farsightedness (positive values).
- Written in diopters (D); the higher the number, the stronger the prescription.
2. Cylinder (CYL):
- Addresses astigmatism, a condition caused by irregular cornea or lens shape.
- Positive or negative values denote the degree of astigmatism correction needed.
3. Axis:
- Specifies the angle (in degrees) for astigmatism correction.
- Ranges from 0 to 180; helps align the cylindrical power correctly.
4. Add:
- Applies to multifocal prescriptions (bifocals, progressives) for additional power needed for reading or close work.
- Written as a positive value.
5. Prism:
- Indicates the amount of prismatic power required to correct eye alignment issues.
- May be present for conditions like strabismus.
6. Base:
- Corresponds to the base direction of the prism (up, down, in, out).
7. Pupillary Distance (PD):
- Measurement between the centers of your pupils.
- Ensures proper alignment of the optical center of the lenses with your eyes.
8. Lens Material and Coating:
- Specifies the type of material for your lenses (e.g., high-index, polycarbonate).
- Coatings may include anti-reflective, anti-scratch, or UV protection.
Reading Example:
- OD (Right Eye): -2.00 -1.25 x 180
- OS (Left Eye): -1.75 -1.50 x 90
- Add: +2.25
- PD: 64
Understanding the Example:
- Right eye has myopia (nearsightedness) of -2.00 diopters with astigmatism of -1.25 at an axis of 180 degrees.
- Left eye has myopia of -1.75 with astigmatism of -1.50 at an axis of 90 degrees.
- Additional power for reading (+2.25) is included.
- Pupillary distance is 64.
Conclusion:
Understanding your prescription empowers you to make informed choices for your eyewear. At Ottika, our team is ready to assist you in finding the perfect frames and lenses tailored to your unique prescription. Explore our online collection for a seamless eyewear experience.
Your clear vision is our priority at Ottika!
Use Our Virtual Try-on To Measure Your Eye PD
What is pupillary distance?
Your PD is the distance in millimetres between the centre of one pupil and the centre of the other pupil. This measurement ensures that we make your lenses with the prescription exactly where your eyes require them, resulting in superior vision!
Types of pupillary measurements
Single PD and dual PD measurements are the two types of PD measurements.
The distance between the centres of one pupil and the centres of the other is referred to as the single or binocular PD measurement. A single PD measurement yields a single value, such as 60, 63, or 55 mm.
The distance between the centre of each pupil and the bridge of the nose is referred to as dual or monocular PD. Dual PD measurements consist of two numbers. For instance, if the dual PD is 31/33, the first number refers to the right eye and the second to the left eye.
How to measure PD online while using Virtual Try-On?
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- Set up for the scan
Hold your phone or camera straight and click on the try-on.
2. Adjust Iris
After step 2, blue lenses pop up on the screen as the iris. Adjust the iris size and press continue.
3. Click filters
Click on the 3 filter lines next to the camera icon at the bottom.
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Note your PD
Once you get your PD, write down the number starting from 42-71 enter in instructions for the order, and mail it to us along with your prescription.
We need your pupillary distance measurement to ensure our lab get your prescription sitting perfectly in your lenses.
The virtual try-on feature is now available on our website.
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