EyeQue VERAI

What is refraction?

Refraction is the part of an eye exam that determines your exact eyeglass or contact lens prescription. It measures how light bends (or refracts) as it enters your eye and helps identify if you’re nearsighted, farsighted, or have astigmatism.

Which tool do I use to measure refraction?

The VERAI device is used to measure refraction. Please review the quick start guide and/or the tutorial video for instructions on how to test with VERAI

Why can’t I see my test history?

If you created a new account using a different email address than the one used with your old account, you will not see your previous tests, and the 2 accounts cannot be linked

I am a long time user, and recall needing to take at least 3 sets of tests with 9 tests per eye. I just took about 7 tests per eye and the app is telling me I’m done testing. Is there something wrong with the app?

Not at all! This is the intent behind incorporating AI into the VERAI app – to make the test process easier, faster, and more accurate!

What is sphere, cylinder, and axis?

Sphere (SPH): This indicates the amount of lens power needed to correct nearsightedness or farsightedness.

A negative (-) number means you are nearsighted (see better up close than far away).

A positive (+) number means you are farsighted (see better far away than up close).

Cylinder (CYL): This shows the amount of correction needed for astigmatism, which is caused by an irregularly shaped cornea. If there’s no astigmatism, this part may be blank or say “DS” (diopters sphere only).

Axis: This tells us the orientation of the astigmatism correction, measured in degrees (1 to 180). It indicates where the irregular curve is located on your eye.

Why are my measurements different each time?

The measurements recorded are based on how you move the red and green lines and indicate when you see only a yellow line.

There are different factors that can cause variations in your results, such as positioning, time of day you test, activity prior to testing (e.g. working on a computer or on your smartphone prior to testing), eye fatigue, accommodation, or even undiagnosed conditions such as diabetes that can cause changes in your vision.

What is this graph for?

The graph is a great tool for tracking your vision for changes over time.

How do I read the graph?

On the y-axis is your power in diopters; negative diopters refers to nearsightedness, and positive diopters refers to farsightedness.

The x-axis lists the dates of your tests – you can select a window of time to focus on or view all dates at once. A trend of increased diopters may mean your vision has changed and may need an updated prescription.

How do I get measurements for reading distance? Computer distance?

VERAI measures distance vision only. If you have an iPhone X or newer, you can download the My Reader Number app to measure the magnification needed for reading or computer distance. We do not have this app available for Androids at this time.

Can I test for prism?

VERAI does not test for prism. We recommend seeing your eye doctor for prism.

Why is OD(right) on the left and vice versa?

While somewhat strange to most, we have the OD (right) listed on the left side and the OS (left) listed on the right because that is how the doctor sees and references your eyes during an exam.

What is PD and what is it used for?

PD, or pupillary distance, is the is the measurement (in millimeters) between the centers of your pupils. It tells us where to place the center of each lens in your glasses so you see clearly and comfortably. The correct PD is especially important for stronger prescriptions or multifocal lenses, as it ensures the lenses are properly aligned with your eyes. An incorrect PD can cause eye strain, headaches, or blurry vision.

How do I measure my PD?

You can measure your PD using EyeQue’s PDCheck frames, the PDCheck AR app (available for iOS only, models 10 or newer), other PD measuring apps, or printing out a PD ruler from the internet.

How often do I need to measure my PD?

Pupillary Distance (PD) typically does not change much after adulthood, so for most adults, measuring it once is usually enough—unless there are significant vision or facial changes.

However, you should consider re-measuring your PD if:

•You’re getting glasses for the first time

•You’re switching to multifocal or progressive lenses

•Your prescription has changed significantly

•You’re under 18, as children’s PD can change as they grow

How come there are different PD measurements? What is the difference?

Your far PD (also referred to as single PD) is the total distance in mm between the centers of your pupils, and is typically used for single-vision glasses. The Left and Right PD (also referred to as dual PD) are separate measurements for each eye to the center of your nose, and is often used for progressive or multifocal glasses.

What is visual acuity?

Visual acuity refers to how clearly you can see. It refers to your ability to see fine details at a specific distance—usually tested by reading letters on an eye chart. The most common format for expressing visual acuity is 20/20 vision.

What is color deficiency/color blindness?

Color deficiency is commonly known as color blindness—is a condition where a person has difficulty seeing certain colors accurately. It usually affects the ability to distinguish between reds and greens, or blues and yellows, depending on the type.

What is contrast sensitivity?

Contrast sensitivity is your eye’s ability to distinguish between an object and its background—even when the difference in color or brightness is subtle. Reduced contrast sensitivity can make everyday activities harder, even if your vision is technically normal. It is important for real-world tasks such as driving at night, recognizing faces, or seeing in low light/fog.

I don’t understand the graph.

The y-axis lists your visual acuity values (snellen not logmar) and the x-axis are the dates that the screenings were completed. The red line is your right eye’s measurements, the blue line is your left eye’s measurements, and if you tested on the Insight device, the green line shows the visual acuity for both eyes simultaneously. This chart is used for tracking your vision for changes over time.

How often should I test these?

It is good practice to screen at least once every 6 months, but you can test as often as you like. Since color deficiency tests and contrast sensitivity tests are not customary tests during a routine eye exam, any changes should be addressed with your doctor.

Screening when you notice a change in your vision is key to keeping on top of your vision health.

Which device(s) do I need to test these?

The Insight Lite is the device to use for screening your visual acuity or contrast sensitivity. If you have the Insight binocular device, that includes the color deficiency test in addition to the visual acuity and contrast sensitivity tests.

Accommodation – The eye’s ability to change the shape of its lens to focus on objects at different distances. This process is crucial for clear vision, allowing us to switch focus from reading a book to seeing a distant object. Essentially, the lens thickens to focus on nearby objects and flattens for distant objects.

ADD – Stands for Additional Power and refers to the extra magnification needed for close-up vision, such as reading. This value is typically used for bifocal or progressive lenses and is added to your distance prescription to help you see clearly at near range.

Astigmatism – A common type of refractive error due to a non – spherical shape of the cornea that causes blurred or distorted vision. This irregular shape prevents light from focusing properly on the retina, leading to symptoms like blurry vision, eyestrain, and difficulty seeing at night.

Axis – The orientation of the astigmatism correction, measured in degrees (1 to 180). It indicates where the irregular curve is located on your eye.

Bi-focals – Eyeglasses with lenses divided into 2 sections, with the top section for distance vision and the bottom section for close-up vision.

Cataracts – A medical condition that results from cloudy areas forming in the lens of the eye, causing vision to be dimmed, hazy or blurred. Cataracts reduce contrast sensitivity and night vision. Cataracts are common and increase with age.

Color Deficiency – Commonly known as color blindness—is a condition where a person has difficulty seeing certain colors accurately. It usually affects the ability to distinguish between reds and greens, or blues and yellows, depending on the type.

Contrast Sensitivity – The eye’s ability to distinguish between an object and its background—even when the difference in color or brightness is subtle. Reduced contrast sensitivity can make everyday activities harder, even if your vision is “technically” normal. It can be affected by conditions like cataracts, glaucoma, diabetic retinopathy, or aging.

Cornea – The transparent part of the eye that covers the iris and the pupil and allows light to enter the eye. The cornea with a positive optical power helps to focuses light on the Retina.

Cylinder – The amount of correction needed for astigmatism, which is caused by an irregularly shaped cornea. If there’s no astigmatism, this part may be blank or say “DS” (diopters sphere only).

Deuteranopia – A deficiency in the ability to see green, often due to a lack of functional green cones in the eye. This can lead to difficulty distinguishing between shades of red, green, orange, brown, and pink.

Encounter – Interactions between patient and medical provider that involve, and are related to obtaining medical advice or a prescription.

ETDRS – A highly accurate and standardized method for measuring visual acuity. It is considered the gold standard in ophthalmology for monitoring vision changes. ETDRS standard for Early Treatment Diabetic Retinopathy Study and uses what is called a tumbling E chart.

EyeQue – US based company that provides accessible, at-home vision care solutions by combining smartphone-attachable medical devices with AI-powered software to measure vision metrics like refractive error and pupillary distance. The company’s technology, including devices such as the VERAI and Insight, allows users to conduct user-driven vision tests at home. EyeQue also offers a cloud-based platform called EyeQue Connect for HIPAA-compliant telemedicine and provides tools for ordering eyeglasses or renewing prescriptions based on the generated “eyeglass numbers”.

EyeQue Tracking Service – EyeQue’s service that allows vision use of EyeQue vision testing devices, access to telemedicine platform and use you to track , analyze and store vision measurements and related information over time.

Glaucoma – A group of eye conditions that lead to high fluid pressure build up in the eye. Glaucoma can result in degraded vision, damage the optic nerve and even cause blindness. The high fluid pressure is a result of the eye not able to drain properly.

Hyperopia – Commonly known as farsightedness, it is a condition where distant objects appear sharp and in focus while near objects appear blurry.

Iris – A flat, colored ring-shaped membrane behind the cornea of the eye that adjusts in size to control the size if the pupil and in turn the amount of light entering the eye. The iris across individuals comes in different colors determined by the amount of melanin pigment it contains. Colors range from light blue, to green, to hazel, to brown, to black. Each iris has a pattern unique to each individual.

LogMAR – An abbreviation for “Logarithmic minimum angle of resolution.” The logic behind the LogMAR form of measurement is that if a patient has 20/20 vision (or 6/6), it means they could read the 20/ 20 line of an eye chart and thus have normal visual acuity. 20/20 Snellen corresponds to a score of 0.0 LogMAR

Myopia – Commonly known as nearsightedness, is a condition where distant objects appear blurry while near objects appear sharp and in focus.

Near Vision – The clarity with which you can see objects at close distances, typically within a meter or two. It’s essentially how well you can read, work on a computer, or see details of objects up close.

OD – Oculus dexter, which is Latin for “right eye.”

OS – Oculus sinister, which is Latin for “left eye.”

OU – Oculus uterque, which is Latin for “both eyes.”

Presbyopia – The natural age-related loss of the eye’s ability to focus on near objects. This condition is caused by the eye’s lens becoming less flexible and harder, making it difficult to change shape and focus on close objects.

Progressive – Eyeglasses similar to bi – focals with 2 distinct sones for reading and distance, tri-focals with 3 distinct zones for near/reading, intermediate, and distance vision, but progressives offer a gradual, seamless transition between the zones.

Protanopia – A type of red-green color blindness where the red cone cells are either missing or not functioning correctly, leading to confusion between red, green, yellow, and brown hues.

Pupillary Distance (PD) – The measurement (in millimeters) between the centers of your pupils. It tells us where to place the center of each lens in your glasses so you see clearly and comfortably. An incorrect PD can cause eye strain, headaches, or blurry vision.

Pupil – Is the adjustable opening of the eye , in the center of the Iris. The pupil appears black because light entering the eye is absorbed by the eyes internal surface. In bright light the pupil contract to 2mm and can dilate up to 8 mm in the dark.

Readers – Also known as reading glasses. Readers make use of positive lenses, often referred to as magnifiers.

Refraction – The part of an eye exam that determines your exact eyeglass or contact lens prescription. It measures how light bends (or refracts) as it enters your eye and helps identify if you’re nearsighted, farsighted, or have astigmatism.

Retina – The light sensitive layer of tissue at the back of the eye. The photoreceptors comprising the retina converts light entering the eye into electrical signals that reach the brain through the optic nerve.

Snellen – Herman Snellen was a Dutch ophthalmologist who invented the Snellen chart, which is the visual acuity chart used in vision testing. During a Snellen chart test, you stand 20 feet away, cover one eye, and read letters aloud starting with the largest.

Sphere – The amount of lens power needed to correct nearsightedness or farsightedness.

A negative (-) number means you are nearsighted (see better up close than far away).

A positive (+) number means you are farsighted (see better far away than up close).

Tracking Service – Allows you to track all your vision measurements over time. It provides a detailed report of all your measurement values and much more.

Tritanopia – A difficulty distinguishing between certain colors, particularly those involving blue or yellow. People may struggle to differentiate between blue and green, purple and red, or yellow and pink.

Tri-focals – Eyeglasses with lenses divided into 3 sections, with the top section for distance vision, the middle section for intermediate (computer) vision, and the bottom section for reading/close-up vision.

VERAI – Virtual Evaluation of Refraction with Artificial Intelligence. It is EyeQue’s AI based application that allows users to take vision measurements using a smartphone at the comfort of their home. VERAI is a complete solution, from measuring the required correction for your eye to getting a signed prescription from a licensed eye care professional

Visual Acuity – A measure of how clearly you can see. It refers to your ability to see fine details at a specific distance—usually tested by reading letters on an eye chart.

(Most common) 20/20 means you can see at 20 feet what a person with normal vision can also see at 20 feet.