A Comparison of the Diagnostic Confidence and Image Quality Between the Eyoto Theia (RDSL) and a Predicate Device.
Condition: Cataract
MeSH terms: Cataract
Study type: Observational

Summary: 
      A clinical study has been identified as a requirement for the RDSL (Theia). This study
      involves a clinical comparison of the imaging from the RDSL with that of a predicate device.

      The clinical evaluation showed that there remains some residual risk in the practitioner's
      ability to use the imaging from the RDSL to detect pathologies at the same level as when
      using the imaging function on a predicate device.

      The aim of this comparative study is to determine the degree, if any, of difference in using
      images captured from the RDSL for clinical inspection of pathologies, when compared to images
      captured from a predicate device.

      Due to the involvement of real patients during the study, ethics approval was sought prior to
      commencement. This study is limited to the clinical benefits of the device.

      An additional Human factors study has been conducted to assess the useability of the device
      Images were taken of healthy eyes and eyes with pathology (with images of several pathologies
      from each major pathology group to give a full range) on both the predicate device, and the
      RDSL.
    

Detailed description: 
      Methodology

      Overview Images were taken of 14 healthy eyes and 35 unhealthy eyes containing a range of
      pathologies on both the predicate device and the THEIA. The pathologies to be imaged have
      been carefully selected using data from the clinical evaluation, and further investigation,
      to ensure that all aspects of the imaging systems and ocular structures are included.

      The images were taken on compliant patients in a real-world setting.

      Device Selection Device Type:AC-powered remote enabled slit-lamp Manufacturer:Eyoto Product
      Number:THEIA (3-008-0001-03)

      Intended Use:

      The THEIA is intended for non-invasive examination, illumination, magnification,
      visualization and recording of digital photographs and video of the anterior and posterior
      eye segments of the human eye and its surrounding area.

      Magnification:6 (base Magnification), 10X, 16X, 25X (digital steps) Filters:Blue
      filter,Red-free filter (digital filter),yellow Filter (fluorescein enhancement filter)
      Lighting:White LED,12 V, 0.7 - 1.5 A, 8.4 W Image Sensor,CMOS, 1.1", 12 Megapixel The latest
      pre-production version of the THEIA was used. This is representative of and has all the same
      functionality as, the production model.

      Three individual THEIA devices of the same version were used to collect the images.

      Predicate Device Device Type:AC-powered slit lamp biomicroscope Manufacturer:Topcon Product
      Number:Topcon SL-2G or equivalent (SL-2D with imaging attachment) Intended Use:The Slit Lamp
      SL-2G is an AC-powered slit lamp biomicroscope intended for use in eye examination of the
      anterior eye segment, from the cornea epithelium to the posterior capsule. It is used to aid
      in the diagnosis of diseases or trauma which affect the structural properties of the anterior
      eye segment.

      Magnification:10X, 16X, 25X Filters:Blue filter, Red-free filter, Yellow Filter (fluorescein
      enhancement filter) available as an accessory Lighting:White LED Image Sensor (DC-4):CMOS, 5
      Megapixel

      The predicate device used for this study was equivalent to the Topcon SL-2G used in the
      substantial equivalence investigation, used with the recommended Topcon Digital Imaging
      Adaptor (DC-4) in order to take the images required.

      Three individual predicate devices will be used to collect the images.
    

Intervention name(s): Remote Digital Slit Lamp
Intervention type(s): Device
Intervention description(s): Slit Lamp Examination
Observational model: Case-Control
Time perspective: Cross-Sectional
Sampling method: Non-Probability Sample
Study population: 
        community