three dimension tomography of eye structures by white light imaging device

Conditions: Healthy Subjects; Moderate to Severe Keratoconjunctivitis Sicca (KCS); Dry Eye Syndrome (DES)

Summary: the purpose of this study is to investigate the ability of an imaging device, developed by adom advanced optical technologies ltd. ("adom"). the device allows a three-dimensional imaging of the ocular tissues, specifically the tear film layers and the retinal layers. the device is based on the use of white light. in this initial study, the device will be used to assess the tear film which coats the corneal surface in healthy subjects as well as in moderate-to-severe keratoconjunctivitis sicca (kcs) or dry eye syndrome (des). the ability of the device to assess the retinal layers will be evaluated in the second phase of the study.

the purpose of this study is to investigate the ability of an imaging device, developed by adom advanced optical technologies ltd. ("adom"). adom has produced an imaging device based on a standard fundus camera that uses white light, and as combined with new algorithms allows for a new reconstruction of three-dimensional images. the materials from which the medical instrumentation and device are comprised are optical components (lenses), a broadband light source power, mechanical engines, beam splitters, and optical filters. the device will in addition contain camera sensors and a spectral detector. these elements are linked to a computer which includes control software and a user interface. the device allows a three-dimensional imaging of the ocular tissues, specifically the tear film layers and the retinal layers. in this initial study, the device will be used to assess the tear film which coats the corneal surface in healthy subjects as well as in moderate-to-severe keratoconjunctivitis sicca (kcs) or dry eye syndrome (des). the ability of the device to assess the retinal layers will be evaluated in the second phase of the study. the aqueous layer of the tear layer thickness is expected to be measured at an accuracy level of approximately one nanometer. all values will be measured over time and thus it will be possible to deduce the breakup time of the tear layer and the evaporation rate. it is possible that information will also be provided on the mucin layer and its level of sharpness. using the device will include the following steps: 1. resting the head and fixing it with the assistance of the chin and forehead rests. 2. locating and focusing the device on the cornea or retina with the help of the examiner. 3. identifying the retinal and vitreous layers and pressing to start measurement or, alternatively: 4. identifying the tear film layers and pressing to start the measurement. 5. pressing on the button to end the measurement. the expected measurement duration is 20 to 70 seconds. analysis of the returned light will describe at each second the thickness of the layers and the continuity of the surface. study population: a total of 20 healthy patients. a total of 40 adult male or female patients with moderate-to-severe kcs or des. conduct of the study: this is a case-control, non-randomized observational study. the study will include two visits: a screening visit and a study visit. during the screening visit the patients will sign the informed consent form and a full medical history will be recorded. all ocular signs and symptoms will be evaluated and a full biomicroscopic examination will be performed. disease activity will be assessed using the dry eye symptom score (dess), schirmer test (st), tear meniscus height (tm), tear break-up time (but), and fluorescein staining (fs). the second visit will be scheduled up to 4 weeks after the screening visit. during the second visit (the photography session), all ocular signs and symptoms will be evaluated and a full biomicroscopic examination will be performed. disease activity will be assessed using the dry eye symptom score (dess), schirmer test (st), tear meniscus height (tm), tear break-up time (but), and fluorescein staining (fs). the tear film layer will be photographed by the investigational device and the participation of the volunteers in the study will end with the end of the photography session. time frame: participants will be followed for the duration of their participation in the study which is expected to be up to 4 weeks.

Eligibility criteria:
inclusion criteria: age \>/= 18 years healthy controls - without dry eyes patients with a diagnosis of moderate-to-severe kcs as defined by all of the following: 1. the presence of at least one ocular symptom of dryness scored at \> 2 (where 0 = none and 4 = very severe /interferes with normal activities) 2. positive schirmer test (st without anesthesia) \< 7 mm/5 min in either eye 3. positive fluorescein stainig (fs), defined as a corneal punctate fluorescein staining score of \> 1 in either eye, where 0 = none and 3 = severe. exclusion criteria: 1. stevens-johnson syndrome 2. post-burn ocular injury 3. chronic ocular disease other than kcs requiring topical treatment 4. ocular herpes simplex virus infection 5. use of contact lenses 6. persistent intraocular inflammation or infection 7. active blepharitis of greater than mild degree 8. recent surgical occlusion of the lacrimal puncta 9. subepithelial cornea scarring 10. anesthetic or neurotrophic corneas.

Keywords: tear film imaging tomogrophy dry eye