Portable Retinal Camera Lens System for Wide Field Imaging
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Solution Overview
Problem
Current retinal and fundus cameras face challenges such as limited field of view, contact with the eye leading to infection risks, bulky and non-portable designs, and inadequate magnification, especially for periphery retina examination in retinopathy of prematurity diagnosis.
Innovation Solution
A portable, non-contact retinal camera with a simple optical system using a high-power 60 to 90 Diopter biconvex aspherical lens for wide field view and a 20 Diopter biconvex achromatic lens for magnification, combined with LED and Infra-Red light sources, and polarizing filters, integrated within a digital camera or cell phone for efficient imaging without pupil dilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a contact camera design is used to achieve wide field of view, then the field of view is improved, but the risk of infection and injury increases due to contact between the light source and the eye
Solution Approach 1:
The patent introduces an intermediary optical system consisting of a 60D or 90D lens combined with a 20D magnifying lens that acts as a mediator between the light source and the patient's eye. This optical intermediary allows the light source to remain at a safe distance from the eye while still achieving wide field of view and adequate magnification for retinal imaging.
2Object-affected harmful factors
If a non-contact fundus camera is used to avoid infection risks, then the safety is improved, but the device becomes bulky and non-portable
Solution Approach 1:
The patent segments the optical system into two distinct lens components: a primary 60D or 90D lens for wide field of view and a secondary 20D magnifying lens for adequate retinal image magnification. This segmentation allows the system to maintain non-contact safety while achieving compact, portable dimensions suitable for field use.
Solution Approach 2:
The patent utilizes high-power lens parameters (60D or 90D combined with 20D) to achieve wide field of view and adequate magnification without requiring a bulky optical system. By changing the optical parameters to use high-diopter lenses, the system achieves both safety and portability.
3Weight of moving object
If a non-contact camera with simple optical system is used to improve portability, then the device becomes compact and portable, but the magnification is inadequate for periphery retina examination
Solution Approach 1:
The patent merges two lens systems with different optical powers: a 60D or 90D lens for wide field of view and a 20D magnifying lens for adequate retinal image magnification. This combination allows the portable device to achieve both wide field of view for periphery retina examination and sufficient magnification for detailed observation.
4Measurement precision
If a complex optical system is used to improve image quality and avoid reflexes, then the imaging quality is improved, but the device becomes bulky and cannot be easily moved
Solution Approach 1:
The patent changes the optical parameters by using high-power lenses (60D or 90D combined with 20D) that provide adequate magnification and image quality with a simpler, more compact optical system compared to traditional non-contact fundus cameras, enabling portability for field work.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables wide-field, non-contact, and efficient retinal imaging with improved magnification, suitable for periphery retina examination, reducing infection risks and facilitating field use with a compact, user-friendly device.
Implementation Method 1
a 60 to 90 Diopter lens for receiving the reflection light from the retina and forming a real and magnified image of the retina
Implementation Method 2
a light source (e.g. Light Emitting Diode (LED)) within the camera and placed close to the camera lens
Implementation Method 3
an Infra-Red LED within the camera and placed close to the camera lens to illuminate the retina of the patient's eye, without initiating the light reflex
Implementation Method 4
polarizing filters, integrated within a digital camera or cell phone for efficient imaging
Data Source
AI summary
A system and method for a portable eye examination camera is described herein. The system and method may include: a light source disposed within said portable camera at a set distance away from an eye of a patient; a first lens within said portable camera for focusing the light from said light source onto a retina of the eye and providing a wide field retinal image; a second lens for receiving said retinal image and causing a magnification of said retinal image; and a digital camera within a mobile computing device for recording said retinal image.