Task Progress:
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Original Project Aims/Objectives: This project is part of an overall Strategy/Plan to develop a compact, comprehensive Multifunctional Ophthalmic (all-in-one) vision testing Device (MOD) to be used during extended space missions to deliver a comprehensive eye health assessment of the astronauts. This MOD will include vision testing functionalities such as retinal imaging, visual-fields, OCT (Optical Coherence Tomography), and Visual Acuity assessment, all inside of one compact device. This project will accomplish the following: Project Primary Deliverables (Phase 1): 1. Develop Detailed Specifications for MOD; 2. Determine Best Strategy - Reach Out to Global Ophthalmic Community; 3. Develop a Technology Roadmap for Building the Device-- a) Potential it can be done, b) How to do it (and with whom), c) Budget, d) Timing
Background -- NASA has recognized that Commercial Off-The-Shelf (COTS) vision testing/diagnostic equipment, individually and collectively, are too large for smaller future deep space spacecraft. Additionally, COTS were not designed for the rigors of space (including electronics that have not been radiation hardened), are skill-dependent (making it difficult for astronauts to use), and are time consuming. NASA has asked the Vision for Mars team to investigate the development of the MOD that have these general requirements: * Single user (one astronaut to operate), * Very easy to operate (minimal training -- possibly computer voice directed), * Small footprint (small as possible/practical) -- in one single device if possible, * Lightweight (under 15lbs./6.8kg.), * Electronics protected from radiation, * Easy to fix in-flight (electronic boards can be easily replaced with spare boards). In order of priority, these are the vision testing capabilities NASA requested: 1. OCT (Optical Coherent Tomography), 2. Retinal imaging, 3. Perimetry (Humphrey Compatible), 4. Optical Biometry, 5. Objective refraction or difference in refraction from baseline, 6. Amsler Grid or more sensitive measurement of metamorphosia (such as hyper-Acuity), 7. Color vision testing.
Project Summary of Key Findings and Results (Phase 1) #1 Deliverable -- Develop Detailed Specifications for MOD. We worked with NASA and industry experts to develop comprehensive specifications for the MOD. The specifications have been completed (as much as possible given that NASA has not developed all of the relevant specifications for the deep space vehicles yet). #2 Deliverable -- Determine Best Strategy and Reach Out to Ophthalmic Community. A. We met with over 30+ companies to find out what relevant technology is available to help develop the MOD. B. We created a Vision for Mars Executive Committee made up of high-level executives from several ophthalmic companies and industry experts to help determine the best strategy to develop the MOD. C. Additionally, we did a global search to find a technology development partner that could assist us in designing the MOD and build a mock-up model of the proposed MOD device. We selected a UK based company called TTP plc ( https://www.ttp.com/ ). #3 Deliverable -- Develop a MOD Technology Roadmap. After investigating several potential designs, we selected the following: A single compact device that has two different optical paths with two eyepieces. One optical path that has all the narrow angle devices (OCT, retinal imaging, aberrometry) and another optical path that has the wide-angle device (visual field). 1. Two separate optical paths: a. Narrow-angle path that contains: i. OCT - optionally modified to include axial biometry, ii. Retinal imaging camera, iii. Aberrometry using Shack-Hartmann method, iv. Objective refraction; b. Wide-angle path: i. Visual field (Humphrey 24-2 compatible). 2. Amsler Grid / Color vision testing via laptop screen (using existing in-flight laptop).
Summary of Proposed MOD Device: One Device with Two Separate Internal Optical Pathways and Two Separate Eyepieces, Self-Imaging, Projected Size - 10 X 10 X 10 (250 mm X 250 mm X 250 mm), Projected Weight = 13 lbs (6 kg), Power Supply for Device Does Not Come from Laptop, Power Will Need to Come from Station/Capsule; DC Power or Might Need Converter to AC - TBD.
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