VISUAL ACUITY MEASUREMENT IN VIRTUAL REALITY HEADSET
An eye examination apparatus comprising: a virtual reality device configured to be worn on a user's head, the virtual reality device having a housing containing a lens and a display operable to display an image to an eye of the user; and a long-pass filter arranged between the lens and the eye for examining the eye's ability to see the image, the long-pass filter having a first transmission region that transmits a visible light and a near-infrared light to the eye and a second transmission region that transmits the near-infrared light and blocks the visible light.
1 . An eye examination apparatus comprising:
a virtual reality device configured to be worn on a user's head, the virtual reality device having a housing containing a lens and a display operable to display an image to an eye of the user; and
a long-pass filter arranged between the lens and the eye for examining the eye's ability to see the image, the long-pass filter having a first transmission region that transmits a visible light and a near-infrared light to the eye and a second transmission region that transmits the near-infrared light and blocks the visible light.
2 . The apparatus of claim 1 wherein the first transmission region comprises a number of pinholes formed through the long-pass filter.
3 . The apparatus of claim 1 wherein the first transmission regions comprises a number of etched regions on the long-pass filter.
4 . The apparatus of claim 3 wherein the transmission of near-infrared light through the first transmission region and the second transmission region is substantially equal.
5 . The apparatus of claim 1 wherein the second transmission region surrounds the first transmission region.
6 . The apparatus of claim 1 wherein the long-pass filter is permanently coupled to the virtual reality device.
7 . The apparatus of claim 1 wherein the long-pass filter is removably coupled to the virtual reality device.
8 . The apparatus of claim 1 further comprising a dichroic filter contained within the housing.
9 . The apparatus of claim 8 further comprising a camera contained within the housing.
10 . The apparatus of claim 9 wherein the dichroic filter and the camera are arranged between the long-pass filter and the display.
11 . An eye examination system comprising:
a virtual reality device configured to be worn on a user's head, the virtual reality device having a housing containing a lens and a display operable to display an image to an eye of the user;
a long-pass filter arranged between the lens and the eye for examining the eye's ability to see the image, the long-pass filter having a first transmission region that transmits a visible light and a near-infrared light to the eye and a second transmission region that transmits the near-infrared light and blocks the visible light; and
one or more processors communicatively coupled to the virtual reality device, the one or more processors configured to receive a response regarding the eye's ability to see the image and determine a visual acuity of the eye.
12 . The system of claim 11 wherein the processor determines a measurement of a sharpness of the image seen by the user's eye based on the response, and the measurement is used to determine the visual acuity of the eye.
13 . The system of claim 11 further comprising an eye tracking assembly having an emitter that emits the near-infrared light to the eye and a camera for tracking a movement of the eye based on a reflection of the near-infrared light, and wherein the tracked movement of the eye is used to select an operation of the virtual reality device.
14 . The system of claim 13 further comprising a dichroic filter, and wherein the dichroic filter and the eye tracking assembly are positioned between the long-pass filter and the display.
15 . The system of claim 11 wherein the first transmission region comprises a pinhole formed through the long-pass filter.
16 . The system of claim 11 wherein the first transmission regions comprises an etched region on the long-pass filter.
17 . The system of claim 11 wherein the second transmission region entirely surrounds the first transmission region.
18 . The system of claim 11 wherein the second transmission region blocks the visible light impinging on the filter from the display.
19 . The system of claim 11 wherein the long-pass filter is permanently coupled to the virtual reality device.
20 . The system of claim 11 wherein the long-pass filter is removably coupled to the virtual reality device.