CN215078341U - Multifunctional detector for optic nerve, pupil sphincter and pupil opening major - Google Patents

Abstract

The utility model relates to a multifunctional detector for optic nerve, pupil sphincter and pupil opening major muscle, white light source radiates white light, and forms stimulating ambient light after homogenizing system, and red light radiates red light to eyes, and the red light carrying eye information enters into the lens after being filtered by the filter plate and is imaged on the CCD sensor by the lens; the high frame frequency CCD sensor is triggered by white light pulse, a continuous shooting mode is started, pupil images at different moments are recorded, and a three-dimensional image (x, y, t dimensions) of pupil transient response is recovered. The utility model discloses light stimulation and light measurement contrast each other, high speed, high stability, high accuracy and three-dimensional transient state measurement's comprehensive advantage has important using value and marketing potentiality in the aspect of clinical medicine, and the conduction reaction time of optic nerve, pupil sphincter contractility and the pupil opening major muscle diffusion ability are measured to this device of accessible, have good diagnosis guiding meaning to clinical diagnosis.

Description

Multifunctional detector for optic nerve, pupil sphincter and pupil opening major

Technical Field

The utility model belongs to the field of medical equipment, especially, relate to a multi-functional detector of optic nerve, pupil sphincter and pupil opening major muscle.

Background

The iris in the eye is in a disc shape, and a small round hole is arranged in the middle of the iris, which is called as the pupil, also called as the "pupil". The normal value is 2.5 mm-8 mm, which is small in bright light and large in dim light. There are two kinds of fine muscles in the iris, one called the sphincter pupillae, which surrounds the pupil and is less than 1mm wide, which governs the contraction of the pupil and is innervated by parasympathetic nerves in the nerves of the eye; the other is called the mydriasis capitis, which is arranged radially in the iris and governs the opening of the pupil, innervated by sympathetic nerves. The two muscles coordinate with each other and restrict each other to adapt to various environments.

The examination of pupil size and contractile response is an objective examination of visual pathway function, and has wide clinical applications, such as early diagnosis of ocular retinal and optic nerve diseases, preoperative evaluation of ocular surgery, especially modern cornea (PRK and LASIK) and phakic refraction (ICL) surgery, auxiliary examination of partial nerve, mental and psychological diseases, new drugs affecting autonomic nerve function, clinical research of new devices, and the like.

In the traditional pupil examination, the pupil size is directly measured by using a ruler, but optometrists have high subjective randomness and poor measurement accuracy; in addition, the pupil is suddenly enlarged or reduced due to the shading of the arm or the ruler, so that a quantitative standard is difficult to be provided. The clinical anterior segment instruments are attached with a pupil size measuring function, the instruments obviously improve the detection precision and the repeatability, but the instruments can only measure the static pupil size and cannot capture the dynamic contraction process of the pupil. And when the pupil changes transiently, the ultrasonic probe is generally used for transmitting ultrasonic signals to automatically scan the pupil of the detected person under different time size change conditions and stretching conditions. During measurement, an instrument or an ultrasonic probe needs to be placed in front of eyes and is close to the eyes, so that the influence of external light stimulation on pupils is influenced, and the error is large; in addition, due to the impedance matching effect of the ultrasonic waves in the air, the signal-to-noise ratio of the measurement result is low, and the high-precision transient pupil photoreaction is not facilitated.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a multifunctional detector of optic nerve, sphincter pupillae and the opening of the pupil major muscle.

The utility model adopts the technical proposal that: a multifunctional detector for optic nerve, sphincter pupillae and dilated pupillae muscle comprises,

the light shading device comprises a shell and a light shading cover arranged at the front end of the shell;

the white light stimulation device is arranged in the shell and receives the instruction to emit stimulation white light;

the red light detection imaging device takes detected red light as a light source and collects a shot object image under the condition of stimulating white light or under the condition of stimulating no white light;

and the electric control system controls the white light stimulation device to emit stimulated white light and controls the red light detection imaging device to acquire a shot object image.

Preferably, the red light detection imaging device comprises a lens and a CCD sensor which are connected with each other, and further comprises red light sources which are uniformly arranged outside the lens.

Preferably, a long-pass filter is arranged in front of the lens and can separate stimulated white light and detected red light.

Preferably, the red light source includes four light sources respectively disposed above, below, to the left, and to the right of the lens.

Preferably, the white light stimulation device comprises an annular wide-angle white light source and a homogenizing system, wherein the homogenizing system covers the annular wide-angle white light source; the homogenization system is frosted fused silica glass.

Preferably, the photosensitive surface of the CCD sensor is plated with a transparent antireflection film.

Preferably, the wavelength of the red light source is 800-900nm, and the central wavelength of the band-pass antireflection film is matched with the wavelength of the red light source.

Preferably, the light shield is rotatably arranged at the front end of the shell, the light shield is a soft silica gel light shield, and one side of the outer edge of the light shield is longer than the other side.

Preferably, a strong magnet is arranged in the light shield, the shell is embedded with the strong magnet, and the light shield is connected with the shell through the strong magnet;

or the front end of the shell extends out to be provided with a connecting ring with a circular section, the connecting ring is outwards protruded to be provided with an annular bulge, the inner wall of the light shield is provided with an annular groove, and the light shield and the shell are connected through the mutual embedding of the annular groove and the annular bulge;

or the light shield is sleeved on the rotating ring, the rotating ring is sleeved on the outer wall of the shell, a bearing is arranged between the rotating ring and the outer wall of the shell, the driving device is further arranged and fixedly arranged on the outer wall of the shell, and the driving device is connected with the rotating ring in a driving mode.

Preferably, the CCD sensor is a black and white high frame rate sensor.

The utility model has the advantages and positive effects that: white light and red light are respectively adopted for stimulating and imaging the glasses, so that the wavelength ranges of light used by an ambient light stimulation system and a detection light system are completely separated, the two beams of light do not influence each other, and the measurement precision and the imaging signal-to-noise ratio are obviously improved; the comprehensive advantages of mutual opposition of light stimulation and light measurement, high speed, high stability, high precision and three-dimensional transient measurement have important application value and market popularization potential in the aspect of clinical medicine;

in addition, the illuminance received by eyes is adjusted by regulating and controlling the input voltage of the white light LED, so that a pupil two-dimensional (x, y) static topography under different illuminance conditions can be quantitatively measured; the acquisition system uses a high frame frequency and black and white CCD sensor, and the white light pulse signal triggers the acquisition function of the CCD sensor, so that a three-dimensional (x, y, t dimension) transient pupil response diagram can be quantitatively measured, the optic nerve conduction response time, the contraction capacity of the sphincter pupillae and the diffusion capacity of the dilated muscularis pupillae can be obtained through analysis and processing, and the system has good diagnosis guiding significance for clinical diagnosis

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a CCD sensor according to an embodiment of the present invention;

FIG. 3 is a roadmap for data processing techniques according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating data processing results according to an embodiment of the present invention;

fig. 5 is a schematic view of a connection structure between a light shield and a housing according to an embodiment of the present invention;

fig. 6 is a schematic view of a connection structure of a light shield and a housing according to an embodiment of the present invention;

fig. 7 is a schematic view of a connection structure between a light shield and a housing according to an embodiment of the present invention.

In the figure:

110. light shield 111, strong magnet 112, annular protrusion

113. Drive device 114, drive gear 115, and ring gear

116. Rotating ring 120, white light stimulation device 121 and white light source

122. Light source homogenizing system 130, red light detection imaging device 131 and long-pass filter

132. Lens 133, CCD sensor 134, and red light source

135. Band-pass antireflection film 140, electric control system 141 and control circuit board

142. Processing apparatus 150, housing

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1, the utility model relates to a multifunctional detector of optic nerve, pupil sphincter and pupil opening major muscle adopts white light stimulation glasses, arouses the shrink and the expansion reaction of pupil, uses ruddiness simultaneously to gather imaging information, collects and shoots pupil transient response, satisfies high SNR, high accuracy, high stability, fast-speed test requirement. The multifunctional detector comprises a light-shading device, a white light stimulation device 120, a red light detection imaging device 130 and an electric control system 140. The light-shading device comprises a shell 150 and a light shade 110 arranged at the front end of the shell 150; the white light stimulation device 120, the red light detection imaging device 130 and the electronic control system 140 are all disposed in the housing 150. The white light stimulation device 120 is arranged in the shell 150 and receives the instruction to emit stimulation white light; the red light detection imaging device 130 collects a shot object image under the condition of stimulating white light or under the condition of stimulating white light by taking detected red light as a light source; the electric control system 140 controls the white light stimulation device 120 to emit stimulation white light, and controls the red light detection imaging device 130 to collect the image of the shot object.

The white light stimulation imaging device is fixedly arranged on the inner wall of the shell 150 and comprises an annular wide-angle white light source 121 and a light source homogenizing system 122. The annular wide-angle white light source 121 may be a white light LED light source, specifically a light source with a color temperature of 3000K, 4000K or 5000K and a half-radiation angle greater than or equal to 50 °. The white light LED is a small-sized high-energy-efficiency light source, an epoxy resin is used for sealing the package, and meanwhile, phosphor is coated on the surface of a white light LED device, so that the white light LED device is used for converting 450nm light emitted by the LED into white light and has a wide emission wavelength range (430nm-730 nm); the annular structure is used, and the color temperature white light LED is selected to effectively simulate the indoor light environment. The light source homogenizing system 122 covers the annular wide-angle white light source 121, and is frosted fused quartz glass. The scattering sheet made of the ground fused silica glass has a repeated, random and uniform pattern structure in the whole light-transmitting aperture, and light rays are scattered to be emitted in all directions after passing through the ground fused silica glass (because the surface of the ground fused silica glass is not a smooth plane, the light rays are subjected to diffuse reflection). The light-transmitting wave band of the fused quartz can be from ultraviolet to infrared, and the experimental requirements can be met. Meanwhile, the annular white light LED can further improve the uniformity of the ambient light and better simulate the ambient light of human eyes.

As shown in fig. 1 and fig. 2, the red light detecting and imaging device 130 includes a lens 132 and a CCD sensor 133 that are connected to each other, and further includes a red light source 134, the red light source 134 is uniformly arranged outside the lens 132 and can be fixed on the CCD sensor 133, a long pass filter 131 is arranged in front of the lens 132, and the long pass filter 131 can separate stimulated white light and detect red light. The lens 132 can adopt a fixed focus or a zoom lens 132, and the focal length is 8-12 mm; the fixed focus or zoom lens 132 with the focal length of 8-12mm is obtained through calculation according to the relation among the size of the CCD light-sensitive surface, the angle of view and the object distance, and meanwhile, the portable non-contact detection can be met. The CCD sensor 133 is a black and white, high frame rate sensor, and the high frame rate CCD sensor 133 can meet the requirement of detecting the size of the transient pupil; compared with the color CCD sensor 133, the commercial black-and-white CCD sensor 133 has the advantages of high frame frequency, higher sensitivity and low price, and these advantages satisfy the product requirements of the transient pupil measuring instrument.

The red LED is disposed on the CCD sensor 133, so that the red light is perpendicularly incident on the eye, and the detailed information of the eye can be better reflected. However, the white light LED is fixed on the inner wall of the housing 150, is not vertically incident to the eye, and is radially transmitted, and homogenizes the white light stimulation light source through diffuse reflection, so as to prevent the local white light from being too strong and damaging the eye.

The red light source 134 may be an LED light source; the human eye is not sensitive to infrared light, so the monochromatic wavelength can not stimulate the eye to cause miosis reaction; in the scheme, the wavelength of the red light source 134 is single wavelength, red light and environment white light are mutually independent, and the filter plate can be used for separating detection light and stimulating environment light, so that the imaging quality is improved. In some embodiments of the scheme, 4 red light LED light sources are used and respectively arranged in the upper, lower, left and right directions of the lens 132, so that the arrangement can also play a certain role in positioning eyes, and improve the detection accuracy and stability; when the red light irradiates the cornea of the eye, 4 bright light spots are reflected back and received by the CCD sensor 133, and the 4 light spots are positioned at the central symmetrical position of the eye by the position of the fine tuning instrument, so that the red light is ensured to be vertically incident on the eye, and the measurement precision and the repeatability are improved.

The CCD light sensing surface is coated with a band-pass antireflection film 135, auxiliary red light carrying eye information enters the lens 132 after being filtered by the filter, and is imaged on the CCD sensor 133 by the lens 132, the CCD sensor 133 light sensing surface is coated with the band-pass antireflection film 135 to further purify a red light spectrum carrying the eye information, and the purified red light is received by the CCD light sensing surface. The red light wavelength range can be 800-900nm, a part of spectrum and white light spectrum can be superposed when the red light wavelength is less than 800nm, and the separation of the red light wavelength is difficult; the red light wavelength is larger than 900nm, the scheme can be used, but the CCD camera needs an infrared camera, and the manufacturing cost is too high; at present, the red light LED which is mature industrially at 850nm has low manufacturing cost and stable performance, and can be detected by using a common visible light CCD, and the scheme preferably uses a red light source 134 with the wavelength of 850 nm. The used band-pass antireflection film 135 needs to be matched with the wavelength of a red light source 134, when the red light source 134 with the wavelength of 850nm is used, the central wavelength of the band-pass antireflection film 135 is also 850nm, and the full width at half maximum of a spectrum is 40 nm; the 850nm band-pass antireflection film 135 is used for further separating the detected red light and the stimulated white light and purifying the detected red light carrying the eye information, so that the imaging signal-to-noise ratio is improved.

The electronic control system 140 includes a control circuit board 141, a processing device 142 and a power supply system, wherein the processing device 142, the CCD sensor 133, the white light stimulation imaging device and the power supply system are all connected to the control circuit board 141. The control circuit board 141 includes a pulse white light circuit board, a white light LED and red light LED brightness adjusting circuit board, and a power supply circuit. The pulse white light circuit board is connected with the annular wide-angle white light source 121, and the white light LED and red light LED brightness adjusting circuit board is connected with the annular wide-angle white light source 121 and the red light source 134; the processing device 142 implements program control, and may be an intelligent device, such as a program control and data processing notebook computer.

The light shield 110 is rotatably arranged at the front end of the shell 150, the light shield 110 is a soft silica gel light shield 110 and can rotate 360 degrees, one side of the outer edge of the light shield 110 is longer than the other side, so that the outer edge of the light shield 110 can be matched with the shape of the face around the eyes, and the measurement requirements of the left eye and the right eye can be met by rotating the light shield 110. Simultaneously, the lens hood 110 of soft silica gel material can set up to many folds structure, through tensile and folding fold department, makes it have certain flexible ability for this lens hood 110 has certain flexible ability, can further accurate manual focus regulation, has further improved the universality and the measurement accuracy of instrument.

In some embodiments of the present invention, one end of the light shield 110 is provided with a strong magnet 111, as shown in fig. 5, the edge of the front end of the housing 150 is embedded with the strong magnet 111, and the light shield 110 is connected to the housing 150 through the strong magnet 111; by changing the direction in which the light shield 110 is coupled to the housing 150, the conversion of left and right eye measurements is achieved. In some embodiments of the present invention, as shown in fig. 6, a connection ring with a circular cross section is extended from the front end of the housing 150, an annular protrusion 112 is protruded from the outer wall of the connection ring, an annular groove is formed in the inner wall of the light shield 110, the light shield 110 has a certain deformation capability, and the light shield 110 and the housing 150 are connected by the mutual engagement of the annular groove and the annular protrusion 112; when the left and right eye measurements need to be switched, the light shield 110 is rotated. In some embodiments of the present invention, as shown in fig. 7, the soft light shielding cover 110 having a certain deformation capability is sleeved on the circular rotating ring 116, the rotating ring 116 is sleeved on the outer wall of the circular housing 150, and a bearing is disposed between the rotating ring 116 and the outer wall of the housing 150, so that the rotating ring 116 can rotate relative to the housing 150; a driving device 113 is further arranged, and the driving device 113 is fixedly arranged on the outer wall of the shell 150; a gear ring 115 is arranged on the outer wall of the rotating ring 116, the driving device 113 is connected with a driving gear 114, and the driving gear 114 is meshed with the gear ring 115, so that the driving device 113 drives the rotating ring 116; the driving device 113 may be a micro motor, which is also connected to the electronic control system 140, and when the rotation is required, the rotation ring 116 is driven to rotate by the driving motor.

Selecting static pupil measurement or dynamic pupil measurement according to measurement requirements, and describing the working process of the multifunctional detector by taking transient pupil measurement as an example:

1. the light shield 110 is tightly attached to the eyes, and the red LED light source is turned on; manually and precisely focusing to ensure that an image observed on the CCD is clearest;

2. the control circuit board 141 regulates and controls voltage output, so that the white light LED outputs white light pulses, and the white light pulses form ambient light stimulation through a homogenizing system on the light source; while the pulsed white light triggers the acquisition system of the CCD sensor 133.

3. The weak red light and the white light carrying the eye information are separated by the long pass filter 131, and the weak red light passes through the filter and enters the lens 132.

4. The red light carrying the eye information is imaged on the CCD sensor 133 through the lens 132, and in order to avoid the influence of the ambient light on the imaging accuracy, the spectrum is further purified by the band-pass antireflection film 135, and the purified red light is finally received by the photosensitive surface of the CCD sensor 133.

5. The high frame rate CCD sensor 133 is triggered by the white light pulse signal, starts the continuous shooting mode, records pupil images at different times, and recovers a three-dimensional image (x, y, t dimensions) of the pupil transient response after being processed by the data processing device 142.

6. The three-dimensional pupil data processing can obtain the conduction response time of the optic nerve, the contraction capacity of the sphincter pupillae and the diffusion capacity of the opening muscle of the pupil.

If the other eye needs to be measured, the measurement requirements of the left eye and the right eye can be met only by rotating the light shield 110 by 180 degrees.

The multifunctional detector realizes dynamic, high-speed and non-contact pupil imaging, and simultaneously data processing can also obtain the information of the conduction response time of optic nerves, the contraction capability of the sphincter pupillae, the diffusion capability of the dilated muscles of the pupil and the like, thereby having good diagnosis guiding significance for clinical diagnosis. The method has important application value and market popularization potential in the aspects of preoperative and postoperative detection, early diagnosis and stage evaluation of related ophthalmic diseases and the like.

The present solution is further illustrated by the following specific examples.

Example (b):

a multifunctional detector for optic nerve, pupil sphincter and pupil opening major comprises a light-shielding device, a white light stimulation device 120, a red light detection imaging device 130 and an electric control system 140. The light-shading device comprises a shell 150 and a light shade 110 arranged at the front end of the shell 150; the light shield 110 is rotatably disposed at the front end of the housing 150, the light shield 110 is a soft silica gel light shield 110, one side of the outer edge of the light shield 110 is higher than the other side, and the outer edge of the light shield 110 can match with the shape of the face around the eyes. The white light stimulation device 120 is fixedly arranged on the inner wall of the shell 150; the white light stimulation device 120 comprises an annular wide-angle white light source 121 and a homogenizing system, wherein the annular wide-angle white light source 121 is an LED light source, the homogenizing system wraps the annular wide-angle white light source 121, and the homogenizing system is frosted fused quartz glass. The red light detection imaging device 130 comprises a lens 132 and a CCD sensor 133 which are connected with each other, and further comprises red light sources 134, wherein the red light sources 134 are uniformly arranged outside the lens 132, and a light-sensitive surface of the CCD sensor 133 is plated with a transparent reflection reducing coating 135; a long-pass filter 131 is arranged in front of the lens 132, and the long-pass filter 131 can separate stimulated white light and detected red light; the red light sources 134 include four light sources respectively arranged on the upper, lower, left and right sides of the lens 132, the red light sources 134 are LED light sources, the wavelength of the red light sources 134 is 850nm, and the central wavelength of the band-pass antireflection film 135 is 850 nm. The electronic control system 140 includes a control circuit board 141, a processing device 142 and a power supply system, and the processing device 142, the CCD sensor 133 and the power supply system are all connected to the control circuit board 141.

The multifunctional detector can be used for detecting transient pupil response, except that hardware is used for obtaining transient pictures of eyes of a detector, a MATLAB-based pupil identification program is also programmed, and a data processing method is as follows:

the eye photographs were processed using the Daugman calculus algorithm to locate the pupillary region and upper and lower eyelid positions, with the formula:

wherein I (x, y) is the eye picture, r is the pupil search radius, G_σAnd (r) is a Gaussian smoothing function, and s is a circular profile integral line with the center of the circle being (x0, y0) and the radius being r.

Similarly, the positions of the upper eyelid and the lower eyelid can be obtained by changing the circular profile integral curve into an arc integral curve. Normally, the pupil is located between the upper and lower eyelids, and in order to reduce the amount of computation and increase the computation speed, the image between the upper and lower eyelids is denoised and then pupil identification is performed, and the 1DGabor algorithm is used to filter the interference of the eyelashes, and the threshold boundary is used to eliminate the influence of the strong reflection light point on the image. According to the sensitivity of the CCD camera, the imaging distance and the detection light intensity, the pupil searching radius and the edge threshold value are optimized, and the pupil size can be identified. The transient pupil data processing technique is shown in fig. 3, and the result is shown in fig. 4.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims (10)

1. A multifunctional detector for optic nerve, sphincter pupillae and dilated pupillae is characterized in that: comprises a light shading device, a light shading device and a light shading device, wherein the light shading device comprises a shell and a light shading cover arranged at the front end of the shell;

the white light stimulation device is arranged in the shell and receives the instruction to emit stimulation white light;

the red light detection imaging device takes detected red light as a light source and collects a shot object image under the condition of stimulating white light or under the condition of stimulating no white light;

and the electric control system controls the white light stimulation device to emit stimulated white light and controls the red light detection imaging device to acquire a shot object image.

2. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of claim 1, wherein: the red light detection imaging device comprises a lens and a CCD sensor which are connected with each other, and further comprises red light sources which are uniformly arranged on the outer side of the lens.

3. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of claim 2, wherein: the long-pass filter is arranged in front of the lens and can separate stimulated white light and detected red light.

4. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of claim 3, wherein: the red light source comprises four light sources which are respectively arranged on the upper, lower, left and right sides of the lens.

5. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of claim 3, wherein: the white light stimulation device comprises an annular wide-angle white light source and a homogenizing system, wherein the homogenizing system covers the annular wide-angle white light source; the homogenization system is frosted fused silica glass.

6. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of claim 3, wherein: and the photosensitive surface of the CCD sensor is plated with a transparent and reflection reducing film.

7. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of claim 6, wherein: the wavelength of the red light source is 800-900nm, and the central wavelength of the band-pass antireflection film is matched with the wavelength of the red light source.

8. The multifunctional detector for optic nerve, sphincter pupillae and dilater pupillae of any one of claims 1-7, wherein: the rotatable setting of lens hood is in the shell front end, the lens hood is soft silica gel lens hood, lens hood outward flange one side is longer than the opposite side.

9. The multifunctional detector for optic nerve, sphincter pupillae and dilated pupillary muscle according to claim 8, wherein: a strong magnet is arranged in the light shield, a strong magnet is embedded on the shell, and the light shield is connected with the shell through the strong magnet;

or, a connecting ring with a circular cross section is arranged at the front end of the shell in a stretching mode, an annular bulge is arranged on the connecting ring in an outward protruding mode, an annular groove is formed in the inner wall of the light shield, and the light shield and the shell are connected through mutual embedding of the annular groove and the annular bulge;

or the light shield is sleeved on the rotating ring, the rotating ring is sleeved on the outer wall of the shell, a bearing is arranged between the rotating ring and the outer wall of the shell, and the light shield is further provided with a driving device, the driving device is fixedly arranged on the outer wall of the shell, and the driving device is in driving connection with the rotating ring.

10. The multifunctional detector for optic nerve, sphincter pupillae and dilated pupillary muscle according to any one of claims 1-7 and 9, characterized in that: the CCD sensor is a black-white high frame frequency sensor.

Images