Is a higher dose always better?

No. Dose-fit rewards landing inside the range studied for the outcome — over-dosing (common with melatonin) or under-dosing both lower the score. The goal is the effective dose, not the biggest number.

What does the Value score mean?

The Value score compares a product's price per serving with clinically relevant products ranked for the same outcome. A score of 50 is the typical price; above 50 means better value than typical, while below 50 means the product costs more than typical. It is a 0–100 value signal, not a percentile.

Why is the cheapest product not #1?

Cost is only one input. The cheapest pick here is a citrate form with weaker absorption and a stock-risk flag, so it leads on Value-for-cost but trails on the composite that also weighs evidence, dose fit and availability.

Are these affiliate links?

Retailer links may be affiliate links and DoseRank may earn a commission. Rankings and placement are determined by the scoring model only — never by payment from a brand.

Is this medical advice?

No. DoseRank summarizes evidence to help you choose; it is not a substitute for a clinician, especially if you are pregnant, breastfeeding, on medication, or managing a health condition.

Improve contrast sensitivity

What this outcome means

Contrast sensitivity is how well your eyes pick out faint edges and shades when colors blend together or light is low. On DoseRank it maps to a defined health outcome built from human studies on contrast sensitivity chart scores, low-contrast acuity, and visual detection thresholds – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Night-driving strugglesDrivers who find dim roads and dusk increasingly hard to read.

Aging eyesOlder adults noticing faint details wash out more than before.

Low-light readersPeople straining to make out soft edges in dim rooms.

Stack buildersAlready taking supplements such as Lutein or Zeaxanthin and want the dose right.

Evidence level

92Strong

Lutein and Zeaxanthin – have strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 90 means this product's ingredient forms and doses are close to what was used in the studies behind this ranking - DoseRank weights each product ingredient.

Best ingredients

Lutein and Zeaxanthin are the best supported ingredient signals for this outcome.

Dose matchedDoseFit 90

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Lutein 20 mg vs 10-20 mg, Zeaxanthin 4 mg vs 2-10 mg.

Processed

715

Available

715

Ingredients

Brands

127

Coverage

100%

How to read the scores

What every metric means

Each score is 0–100. Higher is better for every metric below.

CompositeThe overall DoseRank score — a weighted blend of clinical strength, evidence, dose fit, trust and value.Higher is better

ClinicalHow strongly the formula's ingredients and doses match what clinical studies used for this outcome.Higher is better

EvidenceHow much published human research backs the formula's key ingredients for this outcome — both how many studies exist and how strong they are.Higher is better

ValueHow the price per serving compares with similar products for this outcome — 50 is the typical price, higher means better value for your money.Higher is better

TrustHow well customers rate this product, with extra weight given to ratings backed by a large number of reviews.Higher is better

PopularityHow strongly this product sells compared with the other ranked products for this outcome.Higher is better

This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →

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Get a personal report

A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.

Questions

Frequently asked

Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.

Improve contrast sensitivity

What this outcome means

Who it's for

Night-driving strugglesDrivers who find dim roads and dusk increasingly hard to read.

Aging eyesOlder adults noticing faint details wash out more than before.

Low-light readersPeople straining to make out soft edges in dim rooms.

Stack buildersAlready taking supplements such as Lutein or Zeaxanthin and want the dose right.

Evidence level

92Strong

Best ingredients

Lutein and Zeaxanthin are the best supported ingredient signals for this outcome.

Dose matchedDoseFit 90

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Lutein 20 mg vs 10-20 mg, Zeaxanthin 4 mg vs 2-10 mg.

Processed

715

Available

715

Ingredients

Brands

127

Coverage

100%

Relevant ingredients

Which ingredient types matter for contrast sensitivityOpen to see which ingredient types matter for contrast sensitivity

627 products across 1 ingredient types — open to filter the ranking.

Use types to filter ranked products

Antioxidants & Bioactive Compounds

627 products

Molecules that neutralize free radicals and tune cell signaling. Helpful in balance; mega-doses can blunt the body's own adaptive defenses.

Typical: , ,

Top decision cards

Best products for contrast sensitivity

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for contrast sensitivity

Nutricost, Zeaxanthin with Lutein, 120 Softgels

Nutricost$0.11 / serving4.8 · 6,108Available now

Also helps with

Macular pigment optical density

Visual acuity

Why this ranks here

Evidence fitLutein and Zeaxanthin are the strongest evidence signals for this outcome.
Dose fit2 of 2 dosed ingredients land in the studied range. Lutein at 20 mg lands inside the studied 10-20 mg window.
Price / serving$0.11 per serving — low price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustStrong trust signals — consistently high marks from verified buyer ratings.

The numbers

20 mgIn rangeinside the studied 10-20 mg window

4 mgIn rangeinside the studied 2-10 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

California Gold Nutrition, Lutein with Zeaxanthin from Marigold Extract, 60 Veggie Softgels

California Gold NutritionClinical89Dose fit90Popularity99$0.14/ serving

Doctor's Best, Lutein, Lutemax 2020, 20 mg, 180 Softgels

Doctor's BestClinical89Dose fit90Popularity99$0.16/ serving

Doctor's Best, Lutein , 20 mg, 60 Softgels

Doctor's BestClinical89Dose fit90Popularity91$0.15/ serving

Sports Research, Lutein + Zeaxanthin, Plant-Based, 120 Veggie Softgels

Sports ResearchClinical89Dose fit90Popularity96$0.18/ serving

Natural Factors, Lutein With Zeaxanthin, 120 Softgels

Natural FactorsClinical89Dose fit90Popularity89$0.17/ serving

NOW Foods, Lutein, 20 mg, 90 Veg Capsules

NOW FoodsClinical89Dose fit90Popularity91$0.19/ serving

Doctor's Best, Lutein, Lutemax 2020, 60 Softgels

Doctor's BestClinical89Dose fit90Popularity98$0.22/ serving

NOW Foods, Lutein & Zeaxanthin , 120 Softgels

NOW FoodsClinical89Dose fit91Popularity96$0.24/ serving

Micro Ingredients, Lutein With Zeaxanthin, 240 Softgels

Micro IngredientsClinical89Dose fit93Popularity91$0.19/ serving