How prices per wearing day are computed
The price on the box says little about what lenses cost. A box of 90 daily lenses lasts one eye three months; a box of six monthly lenses lasts it half a year. This site turns every Amazon contact-lens listing into the price of the same thing — one lens worn for one day, in one eye — and ranks by it, so dailies, two-weeklies and monthlies finally compare.
Buy only the brand, base curve, diameter and power on your current prescription; see an eye-care professional for fitting and follow-up.
The price column
| Kind | Categories | Benchmark | Example |
|---|---|---|---|
| Lenses | contact lenses, toric, multifocal, coloured | per 30 wearing days (one eye) | €45.00 for 90 daily lenses = 90 lens-days = €15.00 per 30 wearing days |
| Lens care | lens solution, rewetting drops | per 100 ml | €24.95 for 3 × 355 ml = 1,065 ml = €2.34 per 100 ml |
The lens-day
A lens-day is one lens worn for one day of its replacement schedule, in one eye. A listing’s lens-days are lenses per box × boxes × days per lens, where the days are the manufacturer’s replacement schedule: 1 for a daily lens, 14 for a two-weekly lens, 30 for a monthly lens, 90 for a three-monthly lens and 365 for a yearly lens. A replacement interval the listing states in days (“replace every 14 days”) overrides the schedule. Six monthly lenses for €30.00 are 180 lens-days, or €5.00 per 30 wearing days; 90 daily lenses for €45.00 are 90 lens-days, or €15.00.
The schedule comes from the listing’s own words (“Tageslinsen”, “1-Day”, “Monatslinsen”, “2-week”), else from its product page, else from the maker’s published schedule for the product line it names (Biofinity is a monthly lens, ACUVUE OASYS 1-Day a daily one). “30 Linsen” is a count of lenses, “30 Tage” a schedule; “daily wear” and “3-month supply” are neither. A listing whose schedule nobody states has no price per wearing day; it is listed by package price. Schedule pages such as daily or monthly lenses narrow the list; every lens category page ranks all schedules together.
One box, one eye
Lenses are prescribed per eye, and the two eyes often need different powers, so a box is counted as one eye’s supply. If both your eyes wear the same lens, double the price per 30 wearing days to get your monthly lens cost; the cost per month calculator does that for you.
Lens solution is not included
Two-weekly, monthly and longer-wear lenses need cleaning and storing every night; daily lenses do not. The price per wearing day is the lens price alone. Solutions are ranked separately, per 100 ml, and the daily vs monthly calculator adds a solution budget to the comparison. Multipurpose, peroxide and saline solutions are different products — peroxide needs its own neutralising case, saline only rinses — so they are ranked one type at a time.
Powers, base curves and diameters
Amazon lists every power, base curve and diameter of a lens as its own listing, usually at one price. To us they are one product: powers (−3,00 dpt), base curves (BC 8.6), diameters (DIA 14.2), axes and additions are never read as counts, and every variant of a box gets the same price per wearing day. Each variant still appears as its own row until the catalog folds them together; pick the one that matches your prescription.
The Dk/t column and the highlights
Dk/t is the lens’s oxygen transmissibility as the manufacturer publishes it, usually at a power of −3.00 D: from the listing where it states one, else from the maker’s specification for the product line (Biofinity 160, DAILIES TOTAL1 156, ACUVUE OASYS 1-Day 121). It is a specification, not a measurement of your lens and not a claim about comfort or eye health, and it never changes the ranking. Best value marks the lowest price per wearing day among in-stock listings in the selected category that match your filters, across all result pages; Highest Dk/t marks the highest Dk/t figure. Tied winners share the highlight, and a lone listing gets no badge.
What is estimated, and what never is
A lens count is never invented. One thing makes a price an estimate, marked ~ and removed by “Hide estimates”: a lens count read from a bare “6 Pack” or “2er Pack”, which could count boxes as well as lenses. A schedule taken from the maker’s definition is not an estimate. Prices that cannot be right — 1,000 lenses in a box, a daily lens replaced every 14 days, a price per wearing day far outside the market — are not ranked at all.
What is not listed
Rigid gas-permeable and ortho-k lenses (custom-fitted), lens cases, glasses, costume, sclera and special-effect lenses, plain eye drops not meant for contact lenses, applicators and removers, trial and sample packs, lenses bundled with solution, and eye vitamins are never listed, even when their titles name a lens.
Contact lenses are medical devices
In the EU contact lenses are class IIa medical devices (Medical Device Regulation 2017/745); the United Kingdom regulates them under the Medical Devices Regulations 2002 and the Opticians Act 1989, and Japan classes them as highly controlled medical devices (高度管理医療機器). This site compares prices only: it never fits, prescribes or recommends a lens, and it does not check whether a seller is allowed to sell lenses where you live or asks for your prescription. Buy only the brand, base curve, diameter and power on your current prescription; see an eye-care professional for fitting and follow-up.
Data freshness & countries
Prices are refreshed weekly for seven Amazon storefronts — the United Kingdom, Germany, France, Italy, Spain, Japan and India — each a separate catalog in its own currency; the date above the table shows the last update. Amazon.com and Amazon.ca are not covered, because prescription contact lenses are not part of their range, and Amazon.com.au is not covered until its range has been checked. Prices and availability change at any time — what Amazon shows at checkout is what applies.
Affiliate disclosure
Product links carry an Amazon Associates tag. As an Amazon Associate, this site earns from qualifying purchases, at no extra cost to you. Rankings are computed from the numbers alone and are never sponsored.