Prescription & powers: choosing your Diopter

The one thing you must get right before adding to cart is your power — per eye. Here's how to read a contact lens prescription and pick the correct Diopter for each eye.

Your glasses prescription and your contact lens prescription are not the same — contacts sit on the eye, so they need their own numbers. Use the contact lens prescription or lens parameters from your eye-care professional.

What the numbers mean

A contact lens prescription lists a few parameters. These are the ones you'll select at checkout:

Diopter (PWR / SPH)

Your lens power, a negative number for nearsightedness (e.g. −2.50). The bigger the number, the stronger the correction. Chosen per eye.

OD / OS

OD = right eye, OS = left eye. Each eye often has a different power — always check both.

Base curve (BC)

How curved the lens is, to match your eye's shape. moodyPlus lenses come in standard base curves listed on each product page.

Diameter (DIA)

The overall width of the lens. Also fixed per product and shown on the product page.

Reading an example prescription

Eye

Power (Diopter)

You select

OD (right)

−2.50

OS (left)

−3.00

In this example the eyes differ by 0.50 — so you'd set the right eye to −2.50 and the left to −3.00 at checkout.

How to order, step by step

Find your contact lens prescription

Use the one from your eye-care professional — not your glasses prescription. It should be current and unexpired.

Pick the series and format

Choose your moodyPlus series and daily or monthly format on the product page.

Set the Diopter for each eye

Select the right-eye (OD) and left-eye (OS) power separately. Same power both eyes? Pick the same value twice.

Different power per eye?

If your product uses a single-power selector, add one Diopter first, then add the other eye's power as a second box.

℞

A valid prescription is required. U.S. orders are verified at checkout. These guides help you read and select your power — they don't replace an exam or a fitting. If you're unsure, ask your eye-care professional.

Don't know your power?

If you've worn lenses before, your power is on the box or your prescription card. If you've never been fitted for contacts, you'll need an eye exam first — a glasses prescription alone isn't enough to order contacts safely.

Common questions

Can I use my glasses prescription?+

No. Contact lenses sit directly on the eye and need their own prescription with contact-specific powers and parameters. Use the contact lens prescription from your eye-care professional.

My two eyes have different powers — what do I do?+

That's normal. Select each eye's Diopter separately (OD and OS). If a product only lets you pick one power at a time, add one eye's box first, then add the other eye as a second box.

I have astigmatism — can I order?+

Currently moodyPlus carries spherical lenses (for nearsightedness); we don't yet offer toric lenses for astigmatism. If your astigmatism is mild (under −0.75), some optometrists approve spherical lenses via "spherical equivalent" — please confirm with your eye doctor first.

Got your power?

Pick your series and set the Diopter for each eye on the product page.

Shop the series → Compare the series