Vision Chart Explained: 20/20, 6/6, Snellen Numbers & Eye Test Results

What does 20/20 really mean? Is 6/6 the same thing? Can you have 'normal' chart vision and still have glaucoma or retinal disease? This professional 2026 guide explains Snellen, LogMAR and children's eye charts, then shows how visual acuity connects to refraction, contact lenses, power glasses, ZEISS, TOKAI, high-index lenses and a complete eye checkup in Kathmandu.

Fast Interpretation

6/6 is approximately 20/20. 6/12 is approximately 20/40. 6/60 is approximately 20/200. For people searching eye power test Kathmandu, remember that the vision chart measures acuity while refraction determines the actual prescription power. A vision-chart score measures central visual acuity only. It does not by itself measure peripheral vision, color vision, depth perception, contrast sensitivity or the health of the retina and optic nerve.

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Frequently Asked Questions — Vision Chart, Eye Test, Glasses & Contact Lenses

A vision chart is a standardized set of optotypes used to measure visual acuity.

The Snellen chart is a classic distance visual-acuity chart with progressively smaller optotypes.

It means that at 20 feet you resolve detail that a reference-standard eye resolves at 20 feet.

It is the metric equivalent of approximately 20/20.

No. It describes central high-contrast visual acuity, not all aspects of vision or eye health.

At 20 feet you resolve the detail a reference-standard eye resolves at 40 feet.

It is approximately equivalent to 20/40.

It represents finer measured distance acuity than 20/20.

Legal definitions vary by country and can also include visual-field criteria, so the number alone should not be used as a universal legal definition.

Yes. Central acuity can remain good while glaucoma affects the optic nerve and peripheral field.

Yes. Some retinal conditions may initially spare high-contrast central acuity.

No. A refraction determines prescription power.

It can show reduced distance acuity consistent with myopia, but refraction confirms the optical correction.

Not reliably by itself because young people can sometimes compensate using accommodation.

It can show blur, but refraction is needed to determine cylinder and axis.

A distance chart alone cannot. Near-vision testing and refraction are used.

Visual acuity is the ability to resolve fine visual detail at a specified distance.

Acuity measured without glasses or contact lenses.

The best acuity achieved using an appropriate refractive correction.

It prevents the better eye from hiding reduced vision in the other eye.

A quick test that can reduce optical blur and suggest whether refractive error contributes to reduced acuity.

No.

A logarithmic visual-acuity scale used with standardized charts and often in research.

A standardized logMAR-style chart commonly used when precise visual-acuity measurement is important.

A chart where the patient identifies the direction of the E, useful for non-readers.

A ring-shaped optotype with a gap whose direction is identified.

Standardized symbols, matching tasks, HOTV or LEA-type charts can be used.

Home charts can screen but are sensitive to print size, distance, lighting and technique and do not replace an eye exam.

Validated apps may screen acuity, but they do not replace refraction or eye-health assessment.

An unstable tear film from dry eye can temporarily blur vision and improve after blinking.

Night vision also depends on contrast, glare, pupil size, optical aberrations, dry eye and cataract.

Yes, especially as cataract progresses.

Yes. Glucose fluctuations and diabetic eye disease can affect vision.

Yes when they accurately correct refractive error and fit properly.

It varies by brand, replacement schedule, pack size and prescription type.

Send the exact product and full parameters for a current quote.

Yes, but use a valid contact-lens prescription and a genuine seller.

Brand, spherical/toric/multifocal design, replacement schedule and pack size.

Yes, but decorative lenses still require safe fitting and hygiene.

Use a solution compatible with the specific reusable lens and care system.

It varies by brand, bottle size and care system.

Prescription eyeglasses that correct refractive error.

Frame, prescription, lens index, design, coating and special features.

Its verified current ZEISS service identifies Vision Concern as a ZEISS Vision Expert.

Lens design, index, coating, personalization, prescription and frame.

Vision Concern provides ZEISS lens consultation through its three branches.

A higher-refractive-index lens material that can reduce thickness for suitable prescriptions.

Index, brand, coating, design, prescription and customization.

TOKAI 1.76 is an ultra-high-index plastic option on Vision Concern's verified current page, but final thickness depends on prescription and frame.

A suitable high-index material plus optimized frame size and centration often gives the best result.

It varies by brand, prescription, design, material and coating.

No. Vision Concern does not have a Thamel branch; Lazimpat is a nearby option.

No. It has branches in Lazimpat, Boudha-Tushal and Makalbari.

Vision Concern Lazimpat is a nearby option for Thamel visitors.

Vision Concern has optical services in Lazimpat, Boudha-Tushal and Makalbari.

Compare examination scope, qualified professionals, referral pathways, optical authenticity, location and independent reviews.

Use objective criteria such as credentials, testing quality, transparent advice, referrals and verified reviews rather than relying on one ranking claim.

It is presented here as an eye clinic and optical service, not a surgical eye hospital.

Choose optometry for refraction, glasses or contact lenses and ophthalmology for medical/surgical eye disease.

Ask Vision Concern for today's fee and what is included; this article does not publish an unverified price.

Yes. Vision Concern's verified tourist service supports English-speaking eye examinations.

Selected single-vision prescriptions may be feasible the same day depending on stock, design and workshop availability.

WhatsApp +977 9841466716 with your age, symptoms, current glasses/contact-lens details and preferred branch.

Medical disclaimer: A visual-acuity chart measures central visual clarity but does not diagnose all eye disease. Sudden vision loss, severe pain, new flashes/floaters with a curtain or shadow, significant trauma or acute neurological symptoms require prompt medical or ophthalmic assessment.