DESC:CROSS-REFERENCE TO RELATED APPLICATIONS
This patent application claims the priority of the Indian Provisional Patent Application filed on July 06 2023, with the number 202341045569 and titled, “SYSTEM FOR ALIGNMENT OF OPHTHALMIC DIAGNOSTIC DEVICES”, the contents of which are incorporated herein by the way of reference.

A) TECHNICAL FIELD
[0001] The present invention relates to the field of ophthalmic diagnostic devices. The present invention particularly to an improved optical alignment assembly solution for ophthalmic diagnostic devices that prioritizes patient comfort and well-being while ensuring accurate alignment of the device with the patient's face and eye.

B) BACKGROUND OF THE INVENTION
[0002] OCT, or optical coherence tomography, has revolutionized ophthalmic diagnosis by providing high-resolution, cross-sectional images of ocular structures. However, accurate face and eye alignment in OCT is crucial for reliable diagnostic outcomes. Current alignment methods face challenges in ensuring precise alignment, optical axis matching, and maintaining a correct working distance, while also considering patient comfort during the examination.
[0003] Current alignment methods rely on chinrests and forehead rests, which may not provide optimal comfort or stability. Unintended movements during the examination can introduce motion artifacts and compromise the accuracy of measurements. Furthermore, deviations from the recommended working distance can lead to image blurring or reduced resolution. Also, since OCT is one of the more complicated diagnostic tests, there is a need for ophthalmic diagnostic systems in which OCT is not a necessity for the first part of alignment.
[0004] Therefore, there is a need for an alignment solution that addresses the limitations of current methods by prioritizing patient comfort and well-being while ensuring accurate alignment of ophthalmic diagnostic devices with the patient's face and eye. There is also a need for a system to enhance the ease and accuracy of diagnosing eye conditions and improve the overall experience for patients undergoing eye exams.
[0005] The abovementioned shortcomings, disadvantages and problems are addressed herein, which will be understood by reading and studying the following specification.

C) OBJECT OF THE INVENTION
[0006] The primary object of the present invention is to provide an improved optical alignment system for ophthalmic diagnostic devices.
[0007] Another object of the present invention is to enable achieving proper optical axis matching for accurate imaging and measurements in ophthalmic diagnostic devices.
[0008] Yet another object of the present invention is to provide face stability to minimize involuntary movements and motion artifacts in ophthalmic diagnostic devices.
[0009] Yet another object of the present invention is to enable maintaining a consistent working distance for optimal image quality and focus.
[0010] [0009] Yet another object of the present invention is to improve patient comfort during eye examination and providing an improved optical alignment assembly solution that overcomes patient postural restrictions.
[0011] Yet another object of the present invention is to provide ophthalmic professionals in diagnosing eye conditions with enhanced ease and accuracy and improving the overall experience for individuals undergoing eye exams.
[0012] Yet another object of the present invention is streamlining the alignment process to save time and effort for operators and enhancing the overall effectiveness of ophthalmic diagnostic devices.
[0013] These and other objects and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.

D) SUMMARY OF THE INVENTION
[0014] The various embodiments of the present invention provide an improved optical alignment system for ophthalmic diagnostic devices.
[0015] According to one embodiment of the present invention, an optical alignment assembly solution for ophthalmic diagnostic devices comprises three main assemblies: the Base Unit, the Linear Manipulator, and the Face Alignment Unit. The Base Unit features a counterweight balancing system, a robust stand, and appropriate degrees of freedom for seamless movement. The Linear Manipulator provides precise and controlled linear movement along three axes, allowing for accurate positioning and manipulation of the ophthalmic device. According to one embodiment, the Linear Manipulator is a 3 DOF linear XYZ manipulator or a Linear manipulator based 6 DOF motion stage that allows control on the rotational degrees of freedom as well. The Face Alignment Unit ensures patient comfort and safety during the alignment process, incorporating a soft and comfortable structure, magnetic brakes, and a counterbalancing mechanism. Visual cues and markers aid in correct positioning, and the system prioritizes visibility for the operator.
[0016] According to one embodiment of the present invention, the face alignment system improves upon the traditional approach by utilizing the forehead and cheeks instead of relying on chinrests. It offers a streamlined alignment process, enhanced patient comfort, and improved operator convenience. Visual markers eliminate the need for individual chinrests and forehead rests for each patient, saving time and effort. The system's front foam part conforms to the face's shape, providing cushioned support and accurate positioning. The system includes a widefield camera in the front and a display in the back in the eye line of the operator continuously streaming live feed of patients’ faces, increasing the visibility. The display itself has visual markers and the face alignment hardware also has a few visual markers.
[0017] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating the preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

E) BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings in which:
[0019] FIG. 1 illustrates a system enabling an improved optical alignment system for ophthalmic diagnostic devices, according to one embodiment of the present invention.
[0020] FIG. 2a to 2d illustrate a plurality of views of an implementation of an improved optical system for ophthalmic diagnostic devices, according to one embodiment of the present invention.
[0021] Although the specific features of the present invention are shown in some drawings and not in others. This is done for convenience only as each feature may be combined with any or all of the other features in accordance with the present invention.

F) DETAILED DESCRIPTION OF THE INVENTION
[0022] In the following detailed description, a reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense.
[0023] The various embodiments of the present invention provide an improved optical alignment system for ophthalmic diagnostic devices. The system comprises a Base Unit, a Linear Manipulator, and a Face Alignment Unit.
[0024] According to one embodiment of the present invention, the Base Unit serves as the foundation and incorporates the ophthalmic device, the Face Alignment Unit, and the Linear Manipulator as the end effector. It features a counterweight balancing system and a robust stand, ensuring stability and reducing strain during operation. The counterweight balancing system securely holds the aligning system's mass, prioritizing stability. The support stand provides a reliable foundation for the entire manipulator system.
[0025] According to one embodiment of the present invention, the Linear Manipulator, known as the XYZ linear manipulator, enables precise and controlled linear movement along three axes. It utilizes linear motion technologies such as linear guides, lead screws, or linear motors to achieve smooth and precise motion. The manipulator allows for accurate positioning of the ophthalmic device in three-dimensional space, ensuring high positional accuracy, repeatability, and stability. This enables seamless movement between eyes during tests, without requiring the patient to move or remount the device. It also allows for the adjustment of the center-point and working distance, compensating for variations in mounting and facial structures.
[0026] According to one embodiment of the present invention, the Face Alignment Unit is a carefully designed structure that prioritizes patient comfort and safety during the alignment process. It consists of a soft and comfortable structure that gently sandwiches the patient's face, supported by a chair at the back. This configuration prevents any weight from falling onto the patient's face, ensuring a comfortable experience. Magnetic brakes and a counterbalancing mechanism enhance stability and prevent unwanted movements or pressure on the patient's face. The alignment unit remains fixed while allowing the ophthalmic device to move in the XYZ space, maintaining parallelism between the device's optical axis and the patient's eye. Visibility markers and a design that prioritizes operator visibility facilitate precise positioning and alignment.
[0027] According to one embodiment of the present invention, the Face Alignment Unit departs from traditional chinrests by utilizing the forehead and cheeks, providing a departure from conventional methods. Visual cues and markers eliminate the need for individual chinrests and forehead rests for each patient, streamlining the alignment process. The system simplifies the procedure, ensuring consistent and accurate positioning. The front foam part of the system conforms to the face's shape, providing cushioned support and accurate alignment.
[0028] According to one embodiment of the present invention, a system for aligning an ophthalmic diagnostic device with a patient's eye comprises a base unit that provides stability for the device. The system also includes a linear manipulator coupled to the base unit capable of precise movement along three axes, a face alignment unit designed to ensure patient comfort and accurate alignment with the patient’s face and eye, an optical axis matching mechanism to ensure proper alignment of the patient's eye with the optical axis of the ophthalmic device, a feedback system using image-based feedback and corneal reflectivity to verify and fine-tune the alignment, and an automated alignment apparatus to facilitate the alignment of the ophthalmic device with the patient's eye.
[0029] According to one embodiment of the present invention, the system includes a base unit featuring a counterweight balancing system and a robust stand. This configuration provides appropriate degrees of freedom for seamless movement and ensures stability during operation, thereby reducing strain on both the manipulator and the operator, enhancing the overall functionality and ease of use.
[0030] According to one embodiment of the present invention, the system's linear manipulator employs a combination of linear guides, lead screws, or linear motors to achieve smooth and precise motion along each axis. This design ensures high positional accuracy, repeatability, and stability, allowing the ophthalmic device to move accurately between the patient's eyes without the need for repositioning, thereby improving efficiency and reducing error.
[0031] According to one embodiment of the present invention, the system's face alignment unit comprises a soft and comfortable structure that conforms to the patient’s face. It incorporates magnetic brakes and a counterbalancing mechanism to prevent unwanted movements and includes visual markers to aid in correct positioning, ensuring that the optical axis of the ophthalmic device remains parallel to the patient’s eye, maintaining accuracy and patient comfort.
[0032] According to one embodiment of the present invention, the system's optical axis matching mechanism utilizes corneal OCT reflection and fixation targets to ensure proper alignment of the ophthalmic device with the patient's eye. This mechanism minimizes distortions and artifacts in the images, ensuring that high-quality, accurate diagnostic images are obtained.
[0033] According to one embodiment of the present invention, the system's feedback system includes a corneal reflectivity channel that creates a central line indicating normal light reflection from the eye’s corneal surface. Additionally, it employs image-based feedback to precisely align the scanner with the objective lens, ensuring accurate and reliable alignment throughout the examination process.
[0034] According to one embodiment of the present invention, the system's automated alignment apparatus allows for the selection of the eye to be scanned. The scanner head is equipped with horizontally placed LEDs that use image-based feedback to precisely align the scanner. A live feed camera provides the operator with a real-time view of the patient's face during alignment, facilitating accurate positioning and alignment.
[0035] According to one embodiment of the present invention, a method for aligning an ophthalmic diagnostic device with a patient's eye involves positioning the base unit to provide a stable foundation, using the linear manipulator to adjust the position of the ophthalmic device along three axes, aligning the patient's face with the face alignment unit that utilizes the patient's forehead and cheeks for support, matching the optical axis of the ophthalmic device with the patient's eye, and capturing ophthalmic images while maintaining patient comfort and minimizing movement artifacts.
[0036] According to one embodiment of the present invention, the core functionalities of the method include using the linear manipulator to precisely control the movement of the ophthalmic device along the X, Y, and Z axes, employing the face alignment unit to ensure accurate alignment with the patient’s face, and utilizing the optical axis matching mechanism to align the optical axis of the device with the patient's eye, ensuring high precision and reliability in the diagnostic process.
[0037] According to one embodiment of the present invention, the secondary functionalities of the method involve using a feedback system with image-based feedback and corneal reflectivity to verify and fine-tune the alignment, implementing an automated alignment process to select the eye to be scanned, and employing a live feed camera to provide the operator with real-time visibility of the patient's face during alignment, thereby ensuring precise positioning and enhancing the overall accuracy and efficiency of the examination.
[0038] FIG. 1 illustrates a system enabling an improved optical alignment system for ophthalmic diagnostic devices. The system comprises a Base unit 101, a Counterweight balancing unit 102, a Linear manipulator 103, a Face alignment unit 104, and a Linear motion module 105. The Linear motion module 105 further includes a display module configured to render a live feed.
[0039] FIG. 2a to 2d illustrate a plurality of views of an implementation of an improved optical system for ophthalmic diagnostic devices.
[0040] Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications.

G) ADVANTAGES OF THE INVENTION
[0041] The various embodiments of the present invention provide an improved optical alignment system for ophthalmic diagnostic devices. The invention provides enhanced patient comfort during the alignment process, minimizing discomfort and involuntary movements. The present invention enables consistency in patient position, eliminating voluntary or involuntary movements that could compromise accuracy. It also provides improved visibility for operators, aiding in precise positioning and alignment. The invention includes visual markers and cues that simplify the alignment process, saving time and effort. It includes a streamlined alignment procedure, ensuring accurate and reliable results. The present invention is a departure from traditional chinrests, utilizing the forehead and cheeks for improved alignment. The front foam part that conforms to the face's shape, providing cushioned support and accurate positioning. The invention provides improved efficiency, accuracy, and overall satisfaction in ophthalmic examinations and procedures.
[0042] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such as specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications. However, all such modifications are deemed to be within the scope of the claims.
,CLAIMS:We Claim:
1. A system for aligning an ophthalmic diagnostic device with a patient's eye, the system comprising:
a base unit configured to provide stability for the ophthalmic device;
a linear manipulator coupled to the base unit and capable of precise movement along three axes;
a face alignment unit designed to ensure patient comfort and accurate alignment with the patient’s face and eye;
an optical axis matching mechanism to ensure proper alignment of the patient's eye with the optical axis of the ophthalmic device;
a feedback system using Purkinje images and corneal reflectivity to verify and fine-tune the alignment; and,
an automated alignment apparatus for facilitating the alignment of the ophthalmic device with the patient's eye.

2. The system as claimed in claim 1, wherein the base unit includes a counterweight balancing system and a robust stand, providing appropriate degrees of freedom for seamless movement and ensuring stability during operation, thereby reducing strain on the manipulator and the operator.

3. The system as claimed in claim 1, wherein the linear manipulator utilizes a combination of linear guides, lead screws, or linear motors to achieve smooth and precise motion along each axis, ensuring high positional accuracy, repeatability, and stability, allowing the ophthalmic device to move accurately between the patient's eyes without requiring repositioning, and wherein, the linear manipulator is a 3 degrees-of-freedom linear XYZ manipulator or a linear manipulator based 6 degrees-of-freedom motion stage that allows control on the rotational degrees of freedom as well.

4. The system as claimed in claim 1, wherein the face alignment unit comprises a soft and comfortable structure that conforms to the patient’s face, incorporating magnetic brakes and a counterbalancing mechanism to prevent unwanted movements, and visual markers to aid in correct positioning, ensuring the optical axis of the ophthalmic device remains parallel to the patient’s eye.

5. The system as claimed in claim 1, wherein the optical axis matching mechanism utilizes corneal OCT reflection and fixation targets to ensure proper alignment, minimizing distortions and artifacts in the images.

6. The system as claimed in claim 1, wherein the feedback system includes a corneal reflectivity channel that creates a central line indicating normal light reflection from the eye’s corneal surface, and Purkinje images formed on the tear film to align the scanner precisely with the objective lens.

7. The system as claimed in claim 1, wherein the automated alignment apparatus enables selecting the eye to be scanned, wherein the scanner head is equipped with horizontally placed LEDs using feedback from Purkinje images to align the scanner precisely, and a live feed camera providing the operator with a live feed of the patient's face during alignment.

8. A method for aligning an ophthalmic diagnostic device with a patient's eye, the method comprising:
positioning the base unit to provide a stable foundation;
using the linear manipulator to adjust the position of the ophthalmic device along three axes;
aligning the patient's face using the face alignment unit, which utilizes the patient's forehead and cheeks for support;
matching the optical axis of the ophthalmic device with the patient's eye; and,
capturing ophthalmic images while maintaining the patient’s comfort and minimizing movement artifacts.

9. The method as claimed in claim 8, wherein the core functionalities include the use of the linear manipulator to precisely control the movement of the ophthalmic device along the X, Y, and Z axes, wherein the degrees of freedom include 3 translations and 3 rotational degrees-of-freedom, and wherein, the face alignment unit enables accurate alignment with the patient’s face, and the optical axis matching mechanism to align the optical axis with the patient's eye.

10. The method as claimed in claim 8, wherein the secondary functionalities include the feedback system using Purkinje images and corneal reflectivity to verify alignment, the automated alignment process for selecting the eye to be scanned, and the live feed camera providing real-time visibility to the operator for precise positioning and alignment.