How to find the right Contact Lenses AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Contact Lenses
- Valid contact lens prescription
- Buy only the exact brand, line and parameters written on a current contact lens prescription; a glasses prescription is not a substitute. Contact lenses are regulated medical devices, and fit and power differ from glasses because the lens sits on the eye.
- Base curve and diameter
- Must match the prescription exactly (base curve and diameter in millimetres). A wrong base curve or diameter causes a loose or tight fit, discomfort and corneal problems, even if the power is correct.
- Lens type for your eyes
- Spherical for nearsightedness or farsightedness only, toric (cylinder and axis) for astigmatism, multifocal (add power) for presbyopia. Spherical lenses cannot correct astigmatism or near vision, so the lens type is set by the prescription, not by preference.
- Replacement schedule
- Daily, two-week or monthly. Discard each lens on its labelled schedule regardless of how it feels. Overwearing lenses past their schedule is a leading cause of deposits, discomfort and infection. Daily disposables avoid cleaning entirely.
- Material and oxygen transmission
- Silicone hydrogel lenses have much higher oxygen transmissibility than traditional hydrogel lenses. More oxygen to the cornea matters for long wear days and for any lens approved for overnight wear.
- Overnight wear approval
- Sleep in lenses only if the specific line is approved for extended wear and your eye doctor has cleared it. Sleeping in lenses not approved for it sharply raises the risk of microbial keratitis.
Brands that matter
- Acuvue: Johnson & Johnson Vision; broad range of daily and two-week lenses, including Oasys and Moist lines with toric and multifocal options.
- Alcon: Dailies, Precision1, Total30 and Air Optix lines, covering daily and monthly lenses.
- Bausch + Lomb: Biotrue ONEday, Infuse and Ultra lines, including toric and multifocal versions.
- CooperVision: Biofinity, MyDay, clariti and Proclear lines; strong in toric and multifocal parameter ranges.
What to avoid
- Decorative, colored or costume lenses sold without a prescription or a fitting.
- Switching to a different brand or line than prescribed without a refit, even if the power is the same.
- Rinsing or storing lenses in tap water or saliva, or swimming and showering in reusable lenses.
- Opened, damaged or expired blister packs.
Questions
Can I order contacts using my glasses prescription?
No. A contact lens prescription adds base curve, diameter and the specific lens brand, and the power often differs, so you need a contact lens fitting.
Can I switch to a cheaper brand with the same power?
Not without your eye doctor. Lens materials, base curves and fits differ between lines, so the prescription names a specific lens.