Apparatus to measure interpupillary distance and near point of convergence

Abstract

The present invention relates to an apparatus (100) for automatically measuring interpupillary distance (IPD) and near point of convergence (NPC), thus reducing chances of human error. The apparatus (100) having a T-shaped structure and includes an image acquisition unit (110) and a processing unit (116). The image acquisition unit (110) configured to acquire image and video data of face of the subject, and face of the subject positioned at a frame (114) of the apparatus (100). The processing unit (116) automatically moves the image acquisition unit (110) to acquire accurate measurement of IPD and NPC, and also, moves the frame to adjust eye level based on the image acquisition unit (110). The apparatus (100) provides audio instructions also to enable the subject to perform test easily.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an instrument for examining eyes. More particularly, the present disclosure relates to an apparatus for automatically measuring interpupillary distance (IPD) and near point of convergence (NPC).BACKGROUND

[0002] Background description includes information that may be useful in understanding the present disclosure. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimeddisclosure, or that any publication specifically or implicitly referenced is prior art.

[0003] In the prescription of corrective eyeglasses it is necessary to have knowledge of several biometric data regarding the dimensions and shape of both face and the visual system of the patient, including the respective frame supporting the lenses. With these details, it is feasible to create customised lenses that willremedy the patient's vision problem. The Interpupillary Distance, defined as the distance between the centers of the pupils, is one of the most important biometrical statistics.

[0004] The Interpupillary Distance is a piece of crucial information on the creation of ophthalmic lenses since it defines the distance from the optical axis of both lenses to place in the frame. A precise measurement of this distance is essential for accurate vision correction. If this distance is measured incorrectly (by more than 1 mm), the lenses will be misaligned with the eyes, resulting in blurry vision and eye strain.

[0005] Many optical and eye hospitals in India provide prescription glassesbased on refractive power without measuring the interpupillary distance (IPD).However, if the glasses are not fitted according to the IPD, a subject may experiencea variety of visual problems such as headaches, eye strain, double vision, and so on.

[0006] Convergence Insufficiency (CI) occurs when the subject's brain fails tocoordinate images from both eyes while trying to focus on a nearby object. When aperson reads or looks at a close object, both eyes must turn inward (convergence)in order for the subject to focus. Investigators have observed a prevalence of 4.2percent to 6% in school and clinic settings in research that used establisheddefinitions of Convergence Insufficiency. Eyestrain, headaches, hazy vision,diplopia (double vision), tiredness, difficulty concentrating, print movement whenreading, and loss of comprehension after short durations of reading or doing closeactivities are all common signs of convergence insufficiency. In general,ophthalmic practice, NPC (near point of convergence) is ignored, resulting inasthenopic symptoms such as eyestrain, headaches, burning sensations, lack ofconcentration, difficulty reading and near work.

[0007] There is, therefore, a requirement in the art to obviate the above10mentioned problems by providing an automated apparatus to measure interpupillarydistance (IPD) and near point of convergence (NPC) accurately and without humanintervention.OBJECTS OF THE PRESENT DISCLOSURE

[0008] Some of the objects of the present disclosure, which at least oneembodiment herein satisfy are as listed herein below.

[0009] A general object of the present disclosure is to obviate the abovementionedlimitations, by providing an apparatus for measuring interpupillarydistance (IPD) and near point of convergence (NPC) automatically.

[0010] Another object of the present disclosure is to provide an apparatus formeasuring IPD and NPC automatically, thus reducing chances of human error.

[0011] Yet another object of the present disclosure is to provide an apparatusthat does not require any subjective response from patient, thus chances of receivingwrong responses from the patient are eliminated.

[0012] Yet another object of the present disclosure is to provide an apparatusthat is easy to use.

[0013] Yet another object of the present disclosure is to provide an apparatusthat tracks mild improvement in the patients where vision therapy is given inreceded NPC.SUMMARY

[0014] Aspects of the present disclosure relate to an instrument forexamining eyes. More particularly, the present disclosure relates to an apparatus forautomatically measuring interpupillary distance (IPD) and near point ofconvergence (NPC), thus reducing chances of receiving wrong responses from thepatient. The proposed apparatus is user-friendly and can be used easily without anyeye specialist.

[0015] An aspect of present disclosure relates to an apparatus to measureinterpupillary distance (IPD) and near point of convergence (NPC) of a subject. Theapparatus may include a first member, a second member perpendicularly attachedto the first member, a first measurement unit may be coupled to the first member,and a second measurement unit coupled to the second member, an image acquisitionunit may be coupled to the second member to acquire an image and video data ofeach eye of the subject, a laser device may be attached to the image acquisition unitto emit one or more rays on at least one of the eyes, a frame may be attached at oneend of the first member, and the frame may be configured to hold the face of thesubject at a predefined position, and a processing unit may be operatively coupledto the image acquisition unit and the laser device.

[0016] In an aspect, the processing unit may be configured to receiveacquired image and video data of each eye of the subject, while the subject may befocused on a target positioned at the image acquisition unit, analyse the receivedimage and video data, and correspondingly move the image acquisition unitbetween a first position and a second position at the first member to measureinterpupillary distance (IPD) of the subject by the first measurement unit.

[0017] In an aspect, the processing unit may be configured to move theimage acquisition unit from a third position to a fourth position on the secondmember and may activate a laser device to measure near point of convergence(NPC) of the subject, and displays information on a display device.

[0018] In an aspect, the processing unit may be configured to analyse theimage and video data, while the user is focusing on the target, and moving imageacquisition unit from the third position to the fourth position, and upon detection ofdeviant in at least one of the eyes of the subject, the processing unit may activatesaid laser to record a first distance of deviation.

[0019] In an aspect, the processing unit may be configured to move theimage acquisition unit from the fourth position to the third position and record asecond distance, and each eye focus straight at said target.

[0020] In an aspect, the frame may include a headrest being configured toreceive forehead of the subject and the frame may include a chin rest beingconfigured to receive chin of the subject.

[0021] In an aspect, a motor may be operatively coupled to the frame, andthe motor may be configured to move the chinrest up and down to adjust level ofeach eye with respect to the image acquisition unit, upon receiving instruction fromthe processing unit.

[0022] In an aspect, display unit may be configured to display measuredIPD and NPC of the subject.

[0023] In an aspect, the apparatus may be communicatively coupled to oneor more mobile computing devices, and the information determined may betransmitted to the one or more mobile computing devices through a communicationunit.

[0024] Another aspect of the present disclosure relates to a method tomeasure interpupillary distance (IPD) and near point of convergence (NPC) of asubject. the method may include receiving image and video data of each eye of asubject, by an image acquisition unit, analyzing the received image and video dataof each eye of the subject, activating a motor by a processing unit for moving aframe up and down to adjust level of each eye with respect to the image acquisitionunit, moving the image acquisition unit between a first position and a secondposition at a first member for measuring interpupillary distance (IPD) of the subject,moving the image acquisition unit from a third position to a fourth position on asecond member and activating a laser device to measure near point of convergence(NPC) of the subject, and displaying information on a display device.

[0025] Various objects, features, aspects, and advantages of the inventivesubject matter will become more apparent from the following detailed descriptionof preferred embodiments, along with the accompanying drawing figures in whichlike numerals represent like components.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are included to provide a furtherunderstanding of the present disclosure, and are incorporated in and constitute apart of this specification. The drawings illustrate exemplary embodiments of thepresent disclosure and, together with the description, serve to explain the principlesof the present disclosure. The diagrams are for illustration only, which thus is not alimitation of the present disclosure.

[0027] In the figures, similar components and / or features may have the samereference label. Further, various components of the same type may be distinguishedby following the reference label with a second label that distinguishes among thesimilar components. If only the first reference label is used in the specification, thedescription is applicable to any one of the similar components having the same firstreference label irrespective of the second reference label.

[0028] FIG. 1 illustrates an exemplary block diagram of proposed apparatus, inaccordance with an embodiment of the present disclosure.

[0029] FIG. 2 illustrates an exemplary schematic view of proposed apparatus,in accordance with an embodiment of the present disclosure.

[0030] FIG. 3 illustrates an exemplary front view, of a frame of proposedapparatus, in accordance with an embodiment of the present disclosure.

[0031] FIG. 4 illustrates a method to disclose working of the proposedapparatus, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION

[0032] The following is a detailed description of embodiments of the disclosuredepicted in the accompanying drawings. The embodiments are in such detail as toclearly communicate the disclosure. However, the amount of detail offered is notintended to limit the anticipated variations of embodiments; on the contrary, theintention is to cover all modifications, equivalents, and alternatives falling withinthe spirit and scope of the present disclosure as defined by the appended claims.

[0033] Exemplary embodiments will now be described more fullyhereinafter with reference to the accompanying drawings, in which exemplaryembodiments are shown. This disclosure may, however, be embodied in manydifferent forms and should not be construed as limited to the embodiments set forthherein. These embodiments are provided so that this disclosure will be thoroughand complete and will fully convey the scope of the disclosure to those of ordinaryskill in the art. Moreover, all statements herein reciting embodiments of thedisclosure, as well as specific examples thereof, are intended to encompass bothstructural and functional equivalents thereof. Additionally, it is intended that suchequivalents include both currently known equivalents as well as equivalentsdeveloped in the future (i.e., any elements developed that perform the samefunction, regardless of structure). Embodiments explained herein relate to aninstrument for examining eyes. More particularly, the present disclosure relates toan apparatus for automatically measuring interpupillary distance (IPD) and nearpoint of convergence (NPC), thus reducing chances of receiving wrong responsesfrom the patient. The proposed apparatus is user-friendly and can be used easilywithout any eye specialist.

[0034] An embodiment of present disclosure relates to an apparatus tomeasure interpupillary distance (IPD) and near point of convergence (NPC) of asubject. The apparatus can include a first member, a second memberperpendicularly attached to the first member, a first measurement unit can becoupled to the first member, and a second measurement unit coupled to the secondmember, an image acquisition unit can be coupled to the second member to acquirean image and video data of each eye of the subject, a laser device can be attachedto the image acquisition unit to emit one or more rays on at least one of the eyes, aframe can be attached at one end of the first member, and the frame can beconfigured to hold the face of the subject at a predefined position, and a processingunit can be operatively coupled to the image acquisition unit and the laser device.

[0035] In an embodiment, the processing unit can be configured to receiveacquired image and video data of each eye of the subject, while the subject can befocused on a target positioned at the image acquisition unit, analyse the receivedimage and video data, and correspondingly move the image acquisition unitbetween a first position and a second position at the first member to measureinterpupillary distance (IPD) of the subject by the first measurement unit.

[0036] In an embodiment, the processing unit can be configured to movethe image acquisition unit from a third position to a fourth position on the secondmember and can activate a laser device to measure near point of convergence (NPC)of the subject, and displays information on a display device.

[0037] In an embodiment, the processing unit can be configured to analysethe image and video data, while the user is focusing on said target, and movingimage acquisition unit from the third position to the fourth position, and upondetection of deviant in at least one of the eyes of the subject, the processing unit canactivate said laser to record a first distance of deviation.

[0038] In an embodiment, the processing unit can be configured to movethe image acquisition unit from the fourth position to the third position and recorda second distance, and each eye focus straight at said target.

[0039] In an embodiment, the frame comprising a headrest can beconfigured to receive forehead of the subject and the frame can include a chin restbeing configured to receive chin of the subject.

[0040] In an embodiment, a motor can be operatively coupled to the frame,and the motor can be configured to move the chinrest up and down to adjust levelof each eye with respect to the image acquisition unit, upon receiving instructionfrom the processing unit.

[0041] In an embodiment, display unit can be configured to displaymeasured IPD and NPC of the subject.

[0042] In an embodiment, the apparatus can be communicatively coupledto one or more mobile computing devices, and the information determined can betransmitted to the one or more mobile computing devices through a communicationunit.

[0043] Another embodiment of the present disclosure relates to a method tomeasure interpupillary distance (IPD) and near point of convergence (NPC) of asubject. the method can include receiving image and video data of each eye of asubject, by an image acquisition unit, analyzing the received image and video dataof each eye of the subject, activating a motor by a processing unit for moving aframe up and down to adjust level of each eye with respect to the image acquisitionunit, moving the image acquisition unit between a first position and a secondposition at a first member for measuring interpupillary distance (IPD) of the subject,moving the image acquisition unit from a third position to a fourth position on asecond member and activating a laser device to measure near point of convergence(NPC) of the subject, and displaying information on a display device.

[0044] Referring to FIG. 1 and FIG. 2, an apparatus (100) to measure aninterpupillary distance (IPD) and a near point of convergence (NPC) of a subject(interchangeably referred to as user, hereinafter) is disclosed. The apparatus (100)having a T-shaped structure, and can be used at home, clinics, hospitals, eye centers,or the like, and can be used easily by the subject, without any technician or expert,and readings can be used for spectacles and lense.

[0045] In an embodiment, the apparatus (100) includes a first member (102)and a second member (104) where the second member (104) can be perpendicularlyattached to the first member (102). The first member (102) and the second member(104) can be made of a material such as wood, metal, plastic, or the like. It shouldbe understood that these materials are exemplary only, and therefore should not beconstrued as being limited in any way, other materials can be used also. A firstmeasurement unit (106) can be coupled to the first member (102), and a secondmeasurement unit (108) can be coupled to the second member (104), thus enablingto measure readings accurately.

[0046] In an exemplary embodiment, the length of the first member (102) canbe 8 centimeters, and the length of the second member (104) can be 40 centimeters.However, the length can be varied, based on the requirement.

[0047] In an exemplary embodiment, the first measurement unit (106) and thesecond measurement unit (108) can be fabricated or attached to the first member(102) and the second member (104) respectively.

[0048] In an embodiment, the apparatus includes an image acquisition unit(110), that can be coupled to the first member (102) to acquire an image and videodata of each eye of the subject. The image and video data can be collected in realtimeand can be analysed simultaneously by a processing unit (116). Additionally,the image acquisition unit (110) can be positioned at a support (130), and thesupport (130) can be movably coupled to a set of sliding means (132). The set ofsliding means (132) can include one or more rails, a rotary motor, or the like, whichenables the support (130) to move on the first member (102) and the second member(104). Upon moving the support (130), the image acquisition unit (110) acquiresimage and video data of eyes from various perspectives.

[0049] In an embodiment, a target (134) can be positioned at top side of the theimage acquisition unit (110). The target (134) can be configured to enable thesubject to focus on the target (134) while testing eyes.

[0050] In an embodiment, a frame (114) can be attached at one end of thesecond member (104), and another end of the second member (104) can be attachedto the first member (102). The frame (114) can include a chin rest (122) and aforehead rest (120) to hold face of the subject in a fixed position. In an exemplaryembodiment, while testing the eye, the user can sit on a chair r can hold the face onthe frame (114), by placing chin on the chin rest (122) snd forehead is touched bythe forehead rest (120) to prevent the face from moving and facilitates recordingmeasurement accurately.

[0051] Additionally, a motor (128) can be operatively coupled to the frame(114) (as shown in FIG. 3), and the motor (128) can be configured to move the chinrest (122) up and down to adjust level of each eye with respect to the imageacquisition unit (110), upon receiving instruction from the processing unit (116). Inanother embodiment, the image acquisition unit (110) acquires image and videodata of face of the subject, and transmits the acquired image and video data to theprocessing unit (116). The processing unit (116) analyse the received image andvideo data, and correspondingly activate a motor (128) to move the chin rest (122)up and down to adjust level of each eye with respect to the image acquisition unit(110), to obtain accurate readings.

[0052] In an embodiment, height of the frame (114) can be 20 centimeters (20cm), and the chin rest can be up and down approximately 5 centimeters (5 cm).

[0053] In an embodiment, a laser device (112) can be attached to the imageacquisition unit (110) to emit one or more rays on at least one of the eyes.

[0054] In an embodiment, a display device (118) can be attached to one side ofthe support (130) to display one or more readings determined by the processingunit. The one or more readings can be interpupillary distance (IPD) and near pointof convergence (NPC) of the subject. In another embodiment, the display device(118) can be made of any or a combination of organic light-emitting diodes(OLED), light-emitting diode (LED), liquid crystal display (LCD), or the like.

[0055] In an embodiment, the processing unit (116) can be operatively coupledto the image acquisition unit (110), the laser device (112), and the display device(118). The processing unit (116) can be implemented with one or more applicationspecificintegrated circuits (ASICs), digital signal processors (DSPs), digital signalprocessing devices (DSPDs), programmable logic devices (PLDs), fieldprogrammablegate arrays (FPGAs), controllers, microcontrollers,microprocessors, or other electronic components. Additionally, the processing unit(116) can include, for example, a central processing unit (CPU) that executesmachine instructions for carrying out an analysis of the received image and videodata from the image acquisition unit (110). The machine instructions implementfunctions generally consistent with those described above. CPUs suitable for thispurpose are available, for example, from Intel Corporation, AMD Corporation,Motorola Corporation, and other sources, as will be well known to those of ordinaryskill in this art.

[0056] Additionally, the processing unit (116) can include a random accessmemory (RAM) and non-volatile memory, which can include a read-only memory(ROM) and may include some form of memory storage, such as a CD-ROM, amagnetic tape, a floppy disc, an optical data storage device, and the like. Thesememory devices are bi-directionally coupled to CPU. Such storage devices are wellknown in the art. In addition, the machine instructions and data are temporarilyloaded into RAM from non-volatile memory. Also stored in the non-volatilememory are operating system software and ancillary software.

[0057] In an embodiment, an alert unit (136) can be attached to the apparatusto provide voice instructions to the subject to handle the apparatus (100).

[0058] In an embodiment, a power supply unit (not shown) can be configuredto supply electricity to the image acquisition unit (110), the laser device (112), theprocessing unit (116), the display device (118), the motor (128), the communicationunit (126), and the alert unit (136). In another embodiment, the power supply unitcan include any or a combination of thermoelectric generator, rechargeable battery,rechargeable cell, electrochemical cells, storage battery, secondary cell, capacitorbank, or the like.

[0059] Referring to FIG. 4, a method (400) to illustrate working of proposedapparatus (100) to measure interpupillary distance (IPD) and near point ofconvergence (NPC) of a subject is disclosed.

[0060] At block (402) receiving, image and video data of each eye of thesubject, by an image acquisition unit. The processing unit (116) can be configuredto receive image and video data from the image acquisition unit (110), andcorrespondingly instruct a set of sliding means (132) to move. To initiate testing,the subject or the person testing the eye can turn on the apparatus by a switch (notshown), and choose at least one option from IPD and NPC, and the subject canposition the face on the frame (114).

[0061] At block (404), analyzing the received image and video data of each eyeof the subject and activating, a motor (128) by a processing unit (116) for movinga frame (114) up and down to adjust level of each eye with respect to the imageacquisition unit (110). In an exemplary embodiment, Upon turning on the apparatus(100), the image acquisition unit (110) can acquire image and video data of the faceof the subject from a point 'X', and instruct the motor (128) to move the chin rest(122) as per analysed eye level.

[0062] At block (406), moving the image acquisition unit (110) between a firstposition and a second position at a first member (102) for measuring interpupillarydistance (IPD) of the subject. The processing unit (116) can move the imageacquisition unit (110) between a first position and a second position at the firstmember (102) to measure interpupillary distance (IPD) of the subject by the firstmeasurement unit (106). The first position is left side towards 'A' point at the firstmember (102), and the second position is right side towards 'B' point at the firstmember (102).

[0063] In an embodiment, the image acquisition unit (110) captures the imagesand videos of both eyes of the user from point 'X', and transmits them to theprocessing unit (116). The processing unit (116) analyse the received images andvideos using image processing techniques, and determine near interpupillarydistance (IPD). Further, the target (134) 'T' along with the image acquisitionunit (110) moves from point 'X' towards left that i.e. point 'A' until both the target(134) and left eye pupil center align, at this point, image can be captured. Similarly,from point 'X' towards point 'B' the images can be captured, and the support (130)can be moved until the image acquisition unit (110) and eyes are on straight lineand angle between the eyes center point and the target (134) reached at 90 degreeto capture the image. For example, Near IPD =60mm at point 'X', thus the imageacquisition unit (110) moves 30 mm each side from point X towards point 'A' and'B'.

[0064] At block (408), moving the image acquisition unit (110) from a thirdposition to a fourth position on a second member (104) and activating a laser device(112) to measure near point of convergence (NPC) of the subject. In anembodiment, the processing unit (116) can be configured to move the imageacquisition unit (110) from a third position to a fourth position i.e. from point 'X'to point 'C'on the second member (104). Additionally, the processing unit (116)activates a laser device (112) to measure near point of convergence (NPC) of thesubject.

[0065] In an embodiment, initially, the image acquisition unit (110) can be atpoint 'X', 40 cm away from the subject and slowly the image acquisition unit (110)towards point 'C' at speed of 2 cm per second, by the set of sliding means. Thesubject can be instructed by an audio message provided by an alert unit (136) tofollow the target (134) continuously while the image acquisition unit (110) movestoward the eye at the second member (104). The movement of eyes can be analysedby the image acquisition unit (110) in real-time for checking position of each eye,whenever one eye deviants from its position the apparatus (100) can measuredistance as a near point of convergence (NPC) through the laser device (112).Moreover, the image acquisition unit (110) moves back and record the distance atwhich both eye focus straight at the target (134) again and record it as recovery.When any of the eye is not deviating outside from its focusing straight line till 6 cmfrom the eyes then record as normal and if not deviates after 6 cm then record asover convergence.

[0066] At block (410), displaying information on a display device (118), andthe information pertaining to measured IPD and NPC of the subject. In anembodiment, the processing unit (116) can be configured to display measured IPDand NPC readings on the display device. Also, the measured IPD and NPC readingscan be transmitted to one or more mobile computing devices through acommunication unit (126). The communication unit (126) can be configured totransmit data to the one or more mobile computing devices from the apparatus (100)using wire / wireless communication technology The communication technologyused by the communication unit (126) includes GSM (Global System for Mobilecommunication), CDMA (Code Division Multi Access), LTE (Long TermEvolution), 5G, WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), Bluetooth,RFID (Radio Frequency Identification), Infrared Data Association (IrDA), ZigBee,NFC (Near Field Communication), and the like.

[0067] The proposed method may be described in a general context ofcomputer-executable instructions. Generally, computer-executable instructions caninclude routines, programs, objects, components, data structures, procedures,modules, functions, etc., that perform particular functions or implement particularabstract data types. The method can also be practiced in a distributed computingenvironment where functions are performed by remote processing devices that arelinked through a communications network. In a distributed computing environment,computer-executable instructions may be located in both local and remote computerstorage media, including memory storage devices.

[0068] Although the invention has been described herein with particularembodiments, those skilled in the art will understand that various modifications,changes, and variations may be made in the elements, steps, operation, and detailsof the method, system, and computer program product described herein withoutdeparting the scope thereof. The described invention may be implemented withsome components removed or other components added to the method or systemwithout departing from the invention. The different steps illustrated in the figuresmay not require the particular order shown in the example figures. Additionally,some steps may be eliminated or some steps may be added or the order of some ofthe steps may be changed to the described flow of steps. Furthermore, one or moresteps illustrated in one figure may be appropriately included in another figure in theimplementation of the invention without departing from the scope of the invention.

[0069] While the present invention has been particularly shown and describedwith reference to exemplary embodiments thereof, it will be understood by thoseskilled in the art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the invention as defined by theappended claims. Therefore, the scope of the present invention should not be limitedto the above-described embodiments, but should be determined by all changes ormodifications derived from the scope of the appended claims and equivalents of thefollowing claims.ADVANTAGES OF THE PRESENT DISCLOSURE

[0070] The present disclosure provides an apparatus for measuringinterpupillary distance (IPD) and near point of convergence (NPC) automatically.

[0071] The present disclosure provides an apparatus for measuring IPD andNPC automatically, thus reducing chances of human error.

[0072] The present disclosure provides an apparatus that does not require anysubjective response from user, thus chances of receiving wrong responses from thepatient are eliminated.

[0073] The present disclosure provides an apparatus that is easy to use.

[0074] The present disclosure provides an apparatus to track mildimprovement in the patients where vision therapy is given in receded NPC.

Claims

1. An apparatus (100) to measure interpupillary distance (IPD) and near point of convergence (NPC) of a subject, the apparatus comprising: a first member (102); a second member (104) perpendicularly attached to said first member (102); a first measurement unit (106) coupled to said first member (102), and a second measurement unit (108) coupled to said second member (104); an image acquisition unit (110) coupled to said first member (102) to acquire image and video data of each eye of the subject; a laser device (112) attached to said an image acquisition unit to emit one or more rays on at least one of the eyes; a frame (114) attached at one end of said second member to hold face of the subject at a predefined position; a processing unit (116) operatively coupled to said image acquisition unit (110) and said laser device (112) wherein the processing unit comprising one or more processors coupled with a memory, the memory storing instructions executable by the one or more processors configured to: receive acquired image and video data of each eye of the subject, while the subject is focused on a target (134) positioned at said image acquisition unit; analyse the received image and video data, and correspondingly move the image acquisition unit between a first position and a second position at said first member to measure said interpupillary distance (IPD) of the subject by the first measurement unit; move the image acquisition unit (110) from a third position to a fourth position on the second member and activates said laser device (112) to measure said near point of convergence (NPC) of the subject; and displays information on a display device (118), wherein the information pertains to measured IPD and NPC of the subject.

2. The apparatus as claimed in claim 1, wherein the laser device (112) is attached to the image acquisition unit.

3. The apparatus as claimed in claim 1, wherein the processing unit (116) is configured to analyse the image and video data, while the user is focusing at said target, and moving image acquisition unit from the third position to the fourth position, wherein upon detection of deviant in at least one of the eyes of the subject, the processing unit activates said laser to record a first distance of deviation.

4. The apparatus as claimed in claim 1, the processing unit is configured to move the image acquisition unit from the fourth position to the third position and record a second distance, wherein each of the eye focus straight at said target.

5. The apparatus as claimed in claim 1, wherein the frame comprising a forehead rest (120) being configured to receive forehead of the subject.

6. The apparatus as claimed in claim 1, wherein the frame comprising a chin rest (122) being configured to receive chin of the subject.

7. The apparatus as claimed in claim 1, wherein a motor (128) is operatively coupled to said frame, wherein the motor is configured to move said chinrest up and down to adjust level of each eye with respect to the image acquisition unit, upon receiving instruction from the processing unit.

8. The apparatus as claimed in claim 1, wherein the image acquisition unit is attached to a support (130), wherein the support is configured to move on the first member (102) and the second member (104) by a set of sliding means (132).

9. The apparatus as claimed in claim 1, wherein the apparatus is communicatively coupled to one or more mobile computing devices, wherein the information determined is transmitted to said one or more mobile computing devices through a communication unit (126).

10. A method 400 to measure interpupillary distance (IPD) and near point of convergence (NPC) of a subject, the method comprising: receiving, image and video data of each eye of a subject, by an image acquisition unit; analyzing the received image and video data of each eye of the subject activating, a motor by a processing unit for moving a frame up and down to adjust level of each eye with respect to said image acquisition unit; moving the image acquisition unit between a first position and a second position at a first member for measuring said interpupillary distance (IPD) of the subject; moving the image acquisition unit from a third position to a fourth position on a second member and activating a laser device to measure said near point of convergence (NPC) of the subject; and displaying information on a display device, wherein the information pertaining to measured IPD and NPC of the subject.