Ophthalmic Apparatus Fixation Target Positioning for Mode Switching
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Solution Overview
Problem
Conventional ophthalmic apparatuses require re-adjustment of the subject's eye positioning and fixation guidance when switching between anterior-ocular observation mode and fundus observation mode, leading to complex and troublesome operations, as the visual line direction changes, causing the subject to potentially lose sight of the fixation target.
Innovation Solution
An ophthalmic apparatus with a first optical system for observing the subject's eye and a second optical system that can be moved into or removed from the light path, along with a controller that ensures the fixation targets for fundus observation are projected onto predetermined positions corresponding to the anterior-ocular observation positions, maintaining a stable visual line without changing the eye's alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the second optical system is removed from the light path to switch to fundus observation mode, then the apparatus can observe the fundus, but the fixation target position changes causing visual line direction to change
Solution Approach 1:
The fixation target for fundus observation is preliminarily disposed at a position that corresponds to the fixation target position in anterior-ocular observation mode. This preliminary positioning ensures that when the second optical system is removed, the fixation target remains at the same visual line direction, preventing the need for re-adjustment and maintaining operational simplicity.
Solution Approach 2:
The third fixation target projecting unit acts as an intermediary mechanism that bridges the two observation modes. It projects the fixation target onto predetermined positions that correspond to the anterior-ocular observation positions, serving as a mediator that maintains visual line consistency during mode transition.
2Adaptability or versatility
If the fixation target position changes upon mode switching, then different observation areas can be accessed, but the subject may lose sight of the fixation target
Solution Approach 1:
The fixation target for fundus observation is preliminarily disposed at a position that corresponds to the fixation target position in anterior-ocular observation mode. This preliminary positioning ensures continuous visibility of the fixation target during mode transition, preventing the subject from losing sight of it while still enabling access to different observation areas.
Solution Approach 2:
The fixation target system is designed with multi-functionality to serve both anterior-ocular observation and fundus observation modes. The third fixation target projecting unit projects targets onto predetermined positions that work for both modes, making the system universal and ensuring the fixation target remains visible regardless of the observation mode being used.
3Manufacturing precision
If re-adjustment of positioning is required for each mode, then observation precision can be optimized, but the operation becomes troublesome and complex
Solution Approach 1:
The fixation target positions are preliminarily disposed to correspond between the two observation modes. This preliminary configuration maintains observation positioning precision without requiring re-adjustment during mode switching, thereby simplifying the operation procedure and reducing complexity.
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
Prevents the subject from losing sight of the fixation target during mode switching, eliminating the need for re-adjusting the positioning, thus simplifying the operation and reducing complexity, enabling smooth transitions between anterior-ocular and fundus observations.
Implementation Method 1
a first optical system for observing an illuminated subject's eye, a second optical system for changing an observation area through the first optical system
Data Source
AI summary
An ophthalmic apparatus allows a fixation-target projecting unit for fundus observation to project a fixation target for fundus observation onto a position not coinciding with a center of a light path of an observation optical system but corresponding to a position to which a fixation target for anterior-ocular-observation is projected. Thus, it is not necessary for an operator to perform positioning and fixation guiding operations again, thereby contributing to a shorter imaging time and less complexity and trouble in the overall operation.