Expert tips, lens guides, and eye health advice from our expertly trained opticians
Our clinical team put the OASYS MAX through 6 months of real-world testing. The results surprised us — especially for heavy screen users.
Your contact lens prescription looks like a cryptic string of numbers and abbreviations — but once you know what each term means, it's straightforward. This guide walks through every field you'll see on a typical prescription card.
OD (from Latin oculus dexter) always refers to your right eye. OS (oculus sinister) is your left eye. Some prescriptions also list OU (both eyes together). If your prescription is the same for both eyes, you may see a single set of values with "OU" or the same values repeated.
Sphere is the primary power of your lens, measured in diopters (D). A negative number (e.g., −3.50) means you are nearsighted — you can see up close but struggle at distance. A positive number (e.g., +2.00) means you are farsighted. A prescription close to 0.00 indicates mild correction or no correction needed.
If you have astigmatism, your prescription will include a CYL value and an Axis. The cylinder describes the power difference across the two meridians of your eye, and the axis (0–180°) describes the orientation. If these fields are blank or 0, you don't have significant astigmatism — you'll use standard spherical lenses. If they have values, you need toric lenses (such as ACUVUE OASYS for Astigmatism or AIR OPTIX for Astigmatism).
The Add or ADD power appears on prescriptions for presbyopia — the age-related loss of near vision that typically begins in your 40s. It's always a positive value and is usually listed as Low, Mid, or High (or as a numeric value like +1.75). This value tells the lens manufacturer how much additional reading power to build into the lower portion of a multifocal lens.
Base Curve describes the curvature of the back surface of the lens (how it fits against your eye). Most soft contact lenses come in a BC of 8.3–9.0 mm. Diameter is the width of the lens across its center, typically 13.8–14.5 mm. Some prescriptions list these; others leave them blank because the brand is pre-specified.
Your prescription is brand-specific — it was written for the exact lens you were fitted with. If you want to switch brands, your eye doctor must refit you. Prescriptions in the US expire after 1 year (some states allow 2 years). An expired prescription cannot be used to order lenses.
The question we hear most often: "Are daily lenses really worth the extra cost?" The honest answer is it depends on how often you wear lenses — but the math often surprises people.
A 90-pack of daily lenses covers 45 days of wear (one pair per eye per day). At GenericContacts.com, popular daily lenses range from $38–$65 per 90-pack. If you wear lenses every day of the year, you'll need about 8 boxes — coming to $304–$520/year. The upside? Zero solution cost, maximum convenience, and the cleanest lens wear possible.
A 6-pack of monthly lenses provides 6 months of wear per eye. To cover both eyes for a full year, you need 4 boxes (2 per eye). At $35–$55 per 6-pack, that's $140–$220 for the lenses themselves. But add lens solution ($15–$25/month × 12 = $180–$300/year) and the real cost is $320–$520/year — often comparable to, or more expensive than, dailies once you factor everything in.
Daily lenses are the clear winner if you wear contacts fewer than 5 days per week. When you wear fewer days, you open fewer boxes — the per-use cost of monthlies goes up because you're still buying solution and replacing cases. Dailies also win for allergy sufferers (fresh lens = no accumulated pollen), occasional wearers, and anyone who finds lens care inconvenient.
If you wear contacts every single day and are disciplined about lens care, monthly lenses can still save you a modest amount — usually up to $100/year at the low end of the range, though the gap is much narrower than it looks before solution costs are factored in. They're also the only option for some prescriptions (very high powers, or certain toric/multifocal fits) that aren't available in daily format.
For most contact lens wearers, daily lenses offer the best balance of cost, convenience, and eye health — especially when ordered online at discounted prices. If you currently wear monthlies, try our Lens Finder to see if there's an equivalent daily option within your budget.
Buying GuideFlexible Spending Accounts (FSA) and Health Savings Accounts (HSA) let you pay for qualified medical expenses — including contact lenses — using pre-tax dollars. That means you effectively get a 20–35% discount depending on your tax bracket.
According to IRS Publication 502, the following contact lens-related expenses are FSA/HSA eligible:
An FSA (Flexible Spending Account) is offered through your employer and has a "use it or lose it" rule — unspent funds typically expire December 31. The 2026 contribution limit is $3,300. An HSA (Health Savings Account) requires enrollment in a high-deductible health plan (HDHP) and allows you to roll over unused funds year to year — making it ideal for stocking up on lenses before year-end. HSA funds also grow tax-free if invested.
Your FSA or HSA debit card works exactly like a Visa or Mastercard. At checkout on GenericContacts.com:
If you have remaining FSA dollars in November or December, contact lenses are one of the easiest ways to spend them. A 90-day supply is a smart purchase — lenses don't expire for 1–4 years when unopened. Just make sure you order before your plan's deadline (usually December 31 or March 15 for grace-period plans).
Our clinical team put ACUVUE OASYS MAX 1-Day through 6 months of real-world testing across a range of wearers — from all-day screen users to weekend athletes. Here's what stood out.
OASYS MAX 1-Day is engineered with OptiBlue™ Light Filter and a tear-film stabilizing design aimed squarely at digital eye strain. Testers who spend 8+ hours a day in front of a screen reported noticeably less end-of-day dryness compared to their previous daily lens.
The lens uses a dual-sided aspheric design that stayed centered well during testing, even for wearers who also play sports. Insertion and removal felt comparable to other ACUVUE 1-Day lenses — no learning curve if you're switching from OASYS 1-Day or Moist.
OASYS MAX 1-Day is a strong fit for heavy screen users, people with mild dryness who don't want the maintenance of a monthly lens, and anyone wanting UV protection built into a daily disposable. It's available in sphere and astigmatism (toric) parameters.
If your eyes feel gritty, itchy, or irritated by midday, your lenses could be part of the problem. Here's what our opticians look for when recommending lenses for dry eye sufferers.
Lenses that dehydrate over the course of the day pull moisture from your tear film, which can leave eyes feeling worse by evening — especially with air conditioning, heating, or long screen sessions.
High water-gradient dailies (like Dailies Total1) and lenses with built-in wetting agents (like ACUVUE OASYS MAX 1-Day) are generally better tolerated by dry-eye sufferers than traditional monthly lenses, since a fresh lens each day means no accumulated deposits.
Beyond lens choice: use preservative-free rewetting drops, follow the 20-20-20 rule during screen work (every 20 minutes, look at something 20 feet away for 20 seconds), and replace lenses on schedule — never stretch wear time to save money.
Studies have found that lens cases can harbor more bacteria than a toilet seat — mainly because most people just rinse with tap water and call it done. Here's the right routine.
Eye care professionals recommend replacing your lens case every 1–3 months, even if it looks fine. Cracks and scratches you can't see still harbor biofilm that survives normal cleaning.
Tap water can carry Acanthamoeba, a rare but serious organism that causes a painful, sight-threatening infection in contact lens wearers. Only ever use sterile multipurpose or saline solution on lenses, cases, or your hands right before insertion.
Eye HealthMost people wait far longer than they should. Vision can shift significantly over 12–18 months without you noticing — your brain is remarkably good at compensating for gradual change.
For healthy adults ages 18–60 who wear contacts, an annual exam is the standard recommendation — both to update your prescription and to check overall eye health. Contact lens wearers specifically need annual exams because a valid, current prescription is required to purchase lenses (contact lens Rx expires after 1 year in most states).
See your eye doctor sooner if you notice blurry vision, eye pain, redness that doesn't clear up, sudden floaters or flashes of light, or if your lenses feel uncomfortable in a way that's new.
Routine exams can catch glaucoma, cataracts, and macular degeneration early — often before you'd notice any symptoms yourself. Many serious eye conditions are far more treatable when caught early.
Toric lenses are more complex than standard spherical contacts — here's how they work and what to look for in your prescription.
Standard spherical lenses correct nearsightedness or farsightedness evenly in every direction. Astigmatism means your cornea is shaped more like a football than a basketball, so it needs different correction power along different meridians. Toric lenses have that varying power built in, plus a weighting or stabilization design that keeps the lens from rotating out of position on your eye.
If your prescription includes a CYL (cylinder) value and an Axis, you need toric lenses. The cylinder tells the lab how much extra correction to build in; the axis tells them the orientation. Both numbers must match your brand and parameters exactly — toric lenses aren't as interchangeable between brands as spherical ones.
It's normal for toric lenses to feel slightly different at first, and vision may fluctuate a little right after blinking as the lens re-settles. If a toric lens consistently feels like it's rotating or blurring your vision, contact your eye doctor — the axis or fit may need adjusting.
Kids & TeensThere's no universal age cutoff — it depends far more on maturity and hygiene habits than on the calendar. Many eye doctors successfully fit motivated kids as young as 8, while some teenagers aren't ready until later.
Rather than age, doctors evaluate whether a child can reliably wash their hands before handling lenses, follow a wear-and-replacement schedule without reminders, and communicate clearly if their eyes feel uncomfortable or irritated.
Many pediatric eye doctors recommend starting with daily disposable lenses for younger or first-time wearers — there's no cleaning or storage routine to get wrong, which lowers the risk of infection while a child is still building good habits.
Any child moving into contacts should be fitted and evaluated by an eye doctor first, and should have a comfortable, in-person trial before ordering lenses regularly.
Lens CareSummer's here, and the honest answer isn't what most people want to hear: eye care professionals generally advise against swimming in contact lenses at all.
Pool water, lake water, and ocean water can all introduce bacteria and other microorganisms — including Acanthamoeba — that get trapped between your lens and your eye. Chlorine doesn't fully protect against this, and soft lenses can absorb pool chemicals directly.
If you need clear vision in the water, well-sealed swim goggles (prescription or worn over regular goggles) are the safest option. Some wearers use daily disposables under tightly-sealed goggles as a lower-risk compromise — but this still isn't as safe as skipping lenses in the water entirely.
Remove and discard your lenses (daily) or disinfect them thoroughly (reusable) as soon as possible afterward, and don't reuse a lens that was exposed to non-sterile water.
Eye HealthBlue light gets most of the blame, but the science points to something simpler: when we stare at screens, we blink up to 60% less often — and that's the bigger driver of end-of-day eye strain and dryness.
Reduced blink rate means your tear film evaporates faster than it's replenished. Combine that with close screen distances and poor lighting, and you get the classic symptoms: dryness, blurred vision, headaches, and neck or shoulder tension from posture.
Every 20 minutes, look at something 20 feet away for at least 20 seconds. This simple habit resets your focusing muscles and prompts a full, natural blink cycle.
Lenses like ACUVUE OASYS MAX 1-Day are designed with screen use in mind — built-in blue light filtering and tear-film stabilization can meaningfully reduce end-of-day discomfort for heavy screen users.
