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OD is an abbreviation for the Latin term oculus dexter which means right eye. Notice that the right eye information is asked for first even though we typically read from left to right.
OS is an abbreviation of the Latin oculus sinister which means left eye. That will be referenced on the far right column of the prescription.
SPH is short for sphere. The sphere of your prescription indicates the power on the lenses that is needed to see clearly. A plus (+) symbol indicates the eyeglass wearer is farsighted. A minus (-) symbol indicates that the eyeglass wearer is nearsighted.
CYL is short for cylinder. The cylinder indicates the lens power necessary to correct astigmatism. If the column has no value (is blank), it indicates that the eyeglass wearer does not have astigmatism. If this is the case on your prescription, you can leave it blank when entering it in.
AXIS is a prescription will include an axis value for those with astigmatism. This number represents the angle of the lens that shouldn't feature a cylinder power to help correct your astigmatism.
ADD is short for "additional correction." This is where details about bifocals, multifocal lenses or progressive lenses would appear.
A popular choice for indoor gardening and grow rooms. It is waterproof, heat-insulating, and reflects approximately 92–97% of light to eliminate "hotspots" and improve plant growth. Available at Walmart. Clear Mylar Polyester Film Rolls & Sheets TAP Plastics& more Go to product viewer dialog for this item.
Ideal for DIY projects requiring high clarity and chemical resistance, such as face shields or protective table coverings. Note that this clear version is not for long-term food storage. Purchase from TAP Plastics . 7mil On White Mylar 4' x 100' Hydrobuilder.com& more Go to product viewer dialog for this item. buy mylar roll
This heavy-duty option features a white PE film backing for extra strength and light blocking. It is significantly thicker than standard 2 mil rolls, making it highly tear-resistant and suitable for lining grow room floors. Found at Hydrobuilder.com. A popular choice for indoor gardening and grow rooms
VIVOSUN Horticulture Highly Reflective Mylar Film Roll (4FT X 100FT, 2 Mil) Clear Mylar Polyester Film Rolls & Sheets TAP
Archival Polyester ("Mylar") Rolls, 24" x 100', .004 - #MYR-241-4 Conservation Resources Go to product viewer dialog for this item.
Buying a Mylar roll (technically biaxially-oriented polyethylene terephthalate or BoPET) requires matching the material's specific properties—like thickness, opacity, and reflectivity—to your intended use, whether that's food storage, horticulture, or crafting. Top Product Recommendations
Specifically designed for libraries and laboratories to preserve delicate paper goods and collectibles. This material is pH neutral and chemically inert. Available via Conservation Resources . Key Buying Considerations Go to product viewer dialog for this item. 7mil On White Mylar 4' x 100'
*Discount applied on the current website price at the time of order. Offer only valid for new customer first contacts order over $10. Maximum discount of $100. Cannot be combined with any other offers. Promotions are subject to change without notice. We reserve the right to cancel orders that are in breach of the terms and conditions of this offer.
| Lens Width | Bridge Width | Temple Length | |
|---|---|---|---|
| XS | < 42 mm | < 16 mm | <=128 mm |
| S | 42 mm - 48 mm | 16 mm - 17 mm | 128 mm - 134 mm |
| M | 49 mm - 52 mm | 18 mm - 19 mm | 135 mm - 141 mm |
| L | >52 mm | >19 mm | >= 141 mm |
Buying eyewear should leave you happy and good-looking. Use our sizing tool to find frames that best fit your unique facial measurements.
Grab a regular card with a magnetic stripe on the back. Student IDs, credit cards and gift cards work well to start our online PD tool.
You may have received our paper PD measurement tool in your recent online order. In order to use this tool, place the ruler on your eyes so that the "0" lines up at the centre in between your eyes. Add up the two numbers, to get your PD. See example below:
Click on this link to download and print your own PD measurement tool.
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