Conoscope Lenses

Who uses Conoscope Lenses?

Developers

Optimize and validate the design and performance of your AR/VR displays.

Manufacturers

Implement stringent quality control to ensure compliance with standards.

Researchers

Analyze and understand the characteristics and performance of AR/VR displays.

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Breakthrough of Conoscope Lenses

This colonoscope lens simulates the size, position, and field of view (FOV) of human eyes.

Unlike traditional lenses with internal apertures, its front-mounted aperture allows unobstructed light transmission,

capturing a complete NED FOV of up to 140°. With a 4mm aperture diameter matching the pupil size,

this lens enables precise NED measurements under simulated human eye conditions.

LONTRY® Conoscope Lens VS Conventional Lens

Challenges in Testing VR/AR Near-eye Display

Our visual perception of display quality should be considered as the standard for NED optical measurement.

A NED measuring device should simulate the position of human eyes in HMD and have an

FOV the same as that of human eyes, as well as optical characteristics similar to those of human eyes. The specific challenges are as follows:

1. Small eye relief

You can watch the display from a very close position. In order to create an immersive experience and fill the whole display with the FOV of human eyes, the eye relief (r) of the display lens must be, generally between 12mm and 20mm. This is very challengeable to the front-end size of a test device.

2. Accurate alignment with the pupil position

Observe the display in a narrow head-mounted device. NED is generally inside a head-mounted device (HMD), so the measuring system must be placed in the same position as human eyes. The Aperture diameter (aperture) of a measuring system must simulate the position of pupil inside the HMD in order for the user to receive a complete FOV.

3. Large FOV

Look at the display under a large FOV angle. The horizontal FOV of human eyes is about 114° - 120° , while the display FOV of mainstream VR products has been made 100° - 120° . This puts forward a very high requirement for the optical lens design of measuring devices.

4. High resolution

Observe the displays with very high resolution. To create a visual sense true to nature on the entire display, NED must provide more pixels. The monocular resolution of VR products launched in 2022 reaches 2160x2160. If you need to observe subpixels, VR/AR lenses have to support cameras with a resolution of 6489x6480 or above. This puts forward a very high requirement for the resolution of measuring devices.

1. Small eye relief

You can watch the display from a very close position. In order to create an immersive experience and fill the whole display with the FOV of human eyes, the eye relief (r) of the display lens must be, generally between 12mm and 20mm. This is very challengeable to the front-end size of a test device.

2. Accurate alignment with the pupil position

Observe the display in a narrow head-mounted device. NED is generally inside a head-mounted device (HMD), so the measuring system must be placed in the same position as human eyes. The Aperture diameter (aperture) of a measuring system must simulate the position of pupil inside the HMD in order for the user to receive a complete FOV.

3. Large FOV

Look at the display under a large FOV angle. The horizontal FOV of human eyes is about 114° - 120° , while the display FOV of mainstream VR products has been made 100° - 120° . This puts forward a very high requirement for the optical lens design of measuring devices.

4. High resolution

Observe the displays with very high resolution. To create a visual sense true to nature on the entire display, NED must provide more pixels. The monocular resolution of VR products launched in 2022 reaches 2160x2160. If you need to observe subpixels, VR/AR lenses have to support cameras with a resolution of 6489x6480 or above. This puts forward a very high requirement for the resolution of measuring devices.

What data can Conoscope lenses detect?

Paired with an industrial camera or imaging colorimeters equipped with conoscope lenses can be used in many links of VR / AR manufacturing.

1. Assembly of NED Module

2. Virtual distance measuring of Pancake lens

1. Assembly of NED Module

2. Virtual distance measuring of Pancake lens

3. Measuring of NED Module

To measure the definition, distortion, FOV angle, brightness uniformity and virtual distance of the NED module if used with an industrial camera.
To measure the chromaticity, brightness, contrast, uniformity, Mura (stain), pixel and line defects of the NED module if used with an imaging colorimeter.

4. Whole-unit Inspection of Head-mounted Devices

To measure the definition, distortion, FOV, brightness uniformity and virtual distance of the NED module if used with an industrial camera.
To measure the chromaticity, brightness, contrast ratio, uniformity, and Mura (stain) of the NED module if used with an imaging colorimeter.