To order contact lenses online, you need three things: a valid contact lens prescription (or the details from one), your eye doctor’s name and phone number, and a payment method. That’s the short version. The longer version involves understanding what’s on your prescription, how the verification process works, and how to save money using insurance or tax-advantaged accounts.
Your Contact Lens Prescription
The most important thing you need is a contact lens prescription from an eye exam. This is not the same as a glasses prescription. Contacts sit directly on your eye, while glasses sit about 12 millimeters away from it. That distance changes the corrective power needed, and contact lenses also require fitting measurements that glasses don’t. You cannot use a glasses prescription to order contacts.
Your contact lens prescription includes several values for each eye:
- Brand name: The specific lens your doctor prescribed (for example, Acuvue Oasys or Biofinity).
- OD and OS: Your right eye (OD) and left eye (OS). Each has its own set of numbers.
- Power/Sphere (SPH): The main strength of your correction, measured in diopters.
- Base Curve (BC): How curved the lens is, matched to the shape of your eye.
- Diameter (DIA): The overall size of the lens. Soft contacts typically range from 13.5 to 14.5 millimeters.
- Cylinder (CYL) and Axis: Only present if you have astigmatism. These correct for an irregularly shaped cornea.
If you don’t have a copy of your prescription handy, check the side of your current contact lens box. All of these values are printed on the packaging. Most online retailers let you enter them directly from the box rather than uploading a written prescription.
Why a Glasses Prescription Won’t Work
A glasses prescription only lists the sphere, cylinder, and axis values needed to grind corrective lenses for frames. It doesn’t include a base curve, diameter, or brand name, all of which are required to manufacture and sell you contact lenses. Even the power values differ between glasses and contacts because of the distance between the lens and your eye. If you only have a glasses prescription, you’ll need a separate contact lens fitting exam before you can order online.
Your Eye Doctor’s Information
Every online contact lens retailer is legally required to verify your prescription before shipping your order. Under federal law (the Fairness to Contact Lens Consumers Act), the seller contacts your eye doctor to confirm that the prescription details you entered are accurate and current.
At checkout, you’ll need to provide your doctor’s name and phone number, or sometimes their office name and location. The retailer handles the rest. You don’t need to call your doctor yourself or get them to fax anything. Many retailers have a searchable database of eye care providers, so you may only need to type the office name and select it from a list.
How Prescription Verification Works
Once you place your order, the retailer sends a verification request to your eye doctor’s office. Your doctor then has eight business hours to respond. A “business hour” counts as one hour between 9 a.m. and 5 p.m., Monday through Friday, excluding federal holidays, in your doctor’s time zone. So eight business hours is essentially one full business day, not eight clock hours.
If your doctor confirms the prescription, your order moves forward. If they flag an issue (expired prescription, incorrect values), the retailer will contact you. Here’s the part most people don’t know: if your doctor simply doesn’t respond within those eight business hours, the prescription is verified automatically and the retailer can ship your lenses. This “passive verification” rule exists specifically to prevent doctors from blocking patients who choose to buy lenses elsewhere.
In practice, this means your order might ship the same day if your doctor responds quickly, or within a day or two if they don’t respond at all. Expect some delay if you place your order on a Friday evening, since business hours won’t start counting until Monday morning.
Prescription Expiration
Contact lens prescriptions expire. The standard expiration period is one year in most states, though some states allow two years. The expiration date is printed on your prescription. If yours has lapsed, no online retailer can legally fill it, and verification will fail. You’ll need a new eye exam before ordering.
A quick way to check: if your last eye exam was more than a year ago, your prescription has almost certainly expired.
Payment and Ways to Save
You’ll need a credit or debit card to complete your order. Beyond that, there are a few ways to reduce what you pay out of pocket.
FSA and HSA Accounts
Prescription contact lenses and contact lens solution are both eligible expenses under Health Care Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA). Many online retailers accept FSA/HSA debit cards directly at checkout. If yours doesn’t, you can pay with a regular card and submit for reimbursement afterward. Keep your itemized receipt, because the IRS requires it. Credit card statements and canceled checks don’t count as acceptable documentation.
Vision Insurance
If you have vision insurance like VSP or EyeMed, buying online typically counts as an out-of-network purchase. You pay the full price upfront and then submit a claim for partial reimbursement. For VSP specifically, you’ll need an itemized receipt showing the retailer’s name, the patient’s name, the date of purchase, and a description of what you bought along with the amount paid. Claims can be submitted online or by mail, and reimbursement takes up to 20 business days to process. You generally have 12 months from the purchase date to file, so don’t sit on it too long.
Some online retailers have started partnering directly with specific insurance plans, letting you apply your benefits at checkout. Check your insurer’s website to see if any online retailers are listed as in-network.
Quick Checklist Before You Order
- Contact lens prescription details: brand, power, base curve, diameter, and cylinder/axis if applicable
- Eye doctor’s name and phone number
- Confirmation your prescription hasn’t expired
- Credit card, debit card, or FSA/HSA card
- Your insurance details if you plan to submit for reimbursement
If you have your current contact lens box in front of you and know your eye doctor’s office name, you can complete most online orders in under five minutes. The verification step adds a short wait before shipping, but the process is largely automatic.