Biofinity vs Acuvue Oasys: The Monthly Lens I Actually Prefer

Biofinity and Acuvue Oasys are the two monthly contact lenses I fit more than any others. Between them, they probably account for 70% of the monthly lens prescriptions I see. Patients ask me which one is better at least three times a week, and the truth is both are excellent lenses. But after fitting hundreds of patients in each, I do have a preference, and I will explain exactly why.

Both are silicone hydrogel monthly lenses with high oxygen permeability, strong comfort reputations, and broad prescription ranges. The differences are in the details, and those details matter more than most comparison articles let on.

The Head-to-Head Comparison

Before I get into the nuances, here is the full spec comparison. These are the numbers I reference when patients ask me to break it down objectively.

On paper, these lenses look remarkably similar. Same replacement schedule, same diameter, same sphere range, same extended wear approval. The differences are in the material, moisture approach, and pricing.

Why I Tend to Lean Toward Biofinity

I want to be clear: both are genuinely good lenses and I fit plenty of both. But when a new patient asks for my honest recommendation for a monthly lens, Biofinity is usually where I start. Here is my reasoning.

Moisture retention over 30 days. This is the biggest differentiator in real-world use. Biofinity uses Aquaform technology, which means the moisture-retaining properties are built into the lens material itself. It is not a surface coating. Acuvue Oasys uses Hydraclear Plus, which is a moisture-rich surface treatment. Both feel excellent on day one. The difference shows up around weeks 3 and 4. I hear more complaints about end-of-month dryness from Oasys wearers than Biofinity wearers.

Higher oxygen permeability. Biofinity's Dk/t of 160 is among the highest of any monthly lens. More oxygen reaching the cornea means healthier eyes over time, especially for patients who occasionally wear their lenses longer than they should (which is most people, despite my best efforts).

Price. Biofinity is consistently $5 to $15 cheaper per box in Canada. Over a year, that adds up to $30 to $60 in savings. For a product you replace every month, the lower cost matters, especially for patients paying out of pocket.

Higher water content. Biofinity's 48% water content versus Oasys's 38% contributes to initial comfort and wettability. Higher water content generally means a lens that feels more natural on the eye, though it can also mean slightly more dehydration in very dry environments. For most Canadian climates, including Alberta's dry winters, the higher water content is a net positive because modern silicone hydrogel materials resist dehydration far better than older hydrogel lenses did.

Where Acuvue Oasys Wins

Biofinity is my default recommendation, but there are specific scenarios where Acuvue Oasys is the better choice.

UV protection. Acuvue Oasys blocks over 96% of UVA and 99.9% of UVB radiation. Biofinity has no UV blocking. If you spend significant time outdoors, the built-in UV protection is a genuine advantage. This does not replace sunglasses (the lens only covers the cornea, not the surrounding tissue), but it adds a layer of protection that Biofinity simply does not offer.

Two base curve options. Acuvue Oasys comes in 8.4mm and 8.8mm base curves. Biofinity only comes in 8.6mm. For patients whose corneal curvature falls at the extremes, having that additional option means a better fit. A lens that fits poorly, no matter how advanced its material, is going to be uncomfortable.

Brand trust and familiarity. Many patients come in already wearing Acuvue Oasys and are happy with it. Switching a satisfied patient to save $10 a box is not always the right call. If it is working well and the patient's eyes are healthy, there is no medical reason to change.

Comfort Over 30 Days: What I Actually See

Here is a timeline based on what I hear from patients wearing each lens over a full month. This is anecdotal from hundreds of fittings, not clinical trial data, but it reflects real-world experience.

I want to emphasize: both lenses perform well for 30 days for the majority of patients. The differences I am describing show up in maybe 20 to 30 percent of wearers. If you are currently in Acuvue Oasys and experiencing no issues at all, you are in that happy majority where both lenses work equally well.

Pricing in Canada

Pricing varies by clinic and province, but here is a realistic range for what Canadians pay. These are retail prices before any insurance coverage or manufacturer rebates.

Both CooperVision and Johnson & Johnson run periodic rebate programs. Ask your optician about current promotions before ordering a year's supply. A $30 rebate on a yearly order can close the price gap between the two brands entirely.

If you are looking at contact lenses and want to try either brand, your optometrist will need to do a fitting first. Monthly lenses are not one-size-fits-all, and the right lens is the one that fits your specific eyes, not the one with the best spec sheet.

Which Lens Should You Choose?

Here is my straightforward decision framework:

Start with Biofinity if: you are a new monthly lens wearer, you have mild dry eyes, you want the lower price point, or you tend to push your lenses past 12 hours of daily wear. The Aquaform technology holds up better over long wearing days and across the full 30-day cycle.

Choose Acuvue Oasys if: you spend significant time outdoors and want UV protection built into the lens, your corneal curvature needs the 8.4mm or 8.8mm base curve, or you have been wearing Oasys successfully and have no complaints.

Talk to your optometrist if: you have moderate to severe dry eyes (you might be better served by a daily disposable like Dailies Total 1 or Acuvue Oasys 1-Day), you have astigmatism (both toric versions are excellent but fit differently), or you are over 40 and need multifocal correction.

For a deeper look at how monthlies compare to daily disposables overall, check out my daily vs monthly contacts guide. And if dry eyes are your main concern, the best contacts for dry eyes article covers a broader range of options beyond just these two brands.

Frequently Asked Questions

Is Biofinity or Acuvue Oasys better for dry eyes?

For most patients with mild to moderate dry eyes, Biofinity tends to perform better over a full 30-day cycle. Its Aquaform technology retains moisture as part of the lens material rather than relying on a surface coating. Acuvue Oasys with Hydraclear Plus is excellent for the first couple of weeks, but some patients notice increased dryness in weeks 3 and 4 as deposits accumulate on the surface treatment. That said, comfort is deeply individual. The best approach is to trial both with your optometrist and see which one your specific eyes prefer.

Can I switch from Acuvue Oasys to Biofinity without seeing my eye doctor?

No, and I strongly advise against trying. Even though both are monthly silicone hydrogel lenses, they have different base curves, material properties, and fitting characteristics. A lens that fits one person's cornea perfectly might move too much or too little on another person. Your optometrist needs to evaluate the new lens on your eye to make sure it is sitting properly, moving correctly with each blink, and providing clear vision. The fitting appointment is quick, usually 15 to 20 minutes.

Which lens is cheaper in Canada — Biofinity or Acuvue Oasys?

Biofinity is consistently cheaper. A 6-pack typically runs $45 to $55 compared to Acuvue Oasys at $55 to $65. Over a full year (four boxes for both eyes), Biofinity saves you roughly $30 to $60. Both brands run rebate programs periodically that can reduce the difference. Your optician can tell you about any current promotions. The price gap is wider for toric and multifocal versions.

Can I sleep in Biofinity or Acuvue Oasys lenses?

Both lenses carry FDA approval for up to 6 consecutive nights of extended wear. However, most eye care professionals, myself included, strongly discourage sleeping in any contact lens. Extended wear increases the risk of corneal infections, inflammatory events, and ulcers by 5 to 10 times compared to daily wear. The convenience of not removing your lenses is simply not worth the risk. Take them out every night, clean them properly, and your eyes will be healthier for it.

Do Biofinity and Acuvue Oasys come in toric (astigmatism) versions?

Yes, both brands offer excellent toric lenses for astigmatism. Biofinity Toric uses an optimized ballast design, while Acuvue Oasys for Astigmatism uses what Johnson & Johnson calls Eyelid Stabilized Design. Both stabilize well for most patients, meaning the lens rotates to the correct position and stays there for clear vision. The best toric lens for you depends on your specific cylinder correction, axis, and eyelid anatomy. Your optometrist will determine which one fits your eyes better during a trial fitting.

How long do Biofinity and Acuvue Oasys lenses actually last?

Exactly 30 days from the day you open the blister pack. Not 35 days. Not 40. Not "until they start feeling dry." Even if a lens still feels comfortable at day 35, protein deposits, lipid buildup, and microscopic surface degradation have been accumulating since day one. Wearing lenses past their replacement schedule is one of the most common risk factors for contact lens infections. Mark the replacement date on your phone calendar when you open a new pair.

Is Acuvue Oasys being discontinued?

No. The monthly Acuvue Oasys is not being discontinued. Johnson & Johnson has been expanding the Oasys brand with newer daily disposable products (Acuvue Oasys 1-Day and Oasys MAX 1-Day), which has shifted some marketing focus. But the original monthly Oasys remains widely available and actively prescribed across Canada. If your optical store happens to be out of stock, it is a supply chain issue, not a discontinuation.

This article is for informational purposes only and does not constitute medical advice. Contact lens selection and fitting should always be done under the supervision of a licensed optometrist or ophthalmologist.