{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openvisual.org/schema/profiles/vss/1.1",
  "title": "OVS Profile: Visual Snow Syndrome",
  "description": "Declares the OVS symptom types relevant to Visual Snow Syndrome. VSS is a neurological condition causing persistent visual disturbances — primarily visual snow — with no objective biomarker. This profile is the primary use case for the OVS standard.",
  "type": "object",
  "properties": {
    "profile_id":      { "const": "ovs-profile:vss" },
    "profile_version": { "const": "1.1" },
    "primary_symptoms": {
      "description": "Always present in VSS diagnosis",
      "type": "array",
      "items": { "type": "string" },
      "const": ["ovs:vss-snow", "ovs:blue-field-entoptic", "ovs:photopsia"]
    },
    "common_comorbidities": {
      "description": "Present in a majority of VSS patients. 1.1 adds photophobia, nyctalopia, derealization, vertigo and tremor, listed as frequent (30-79%) by Orphanet ORPHA:420556",
      "type": "array",
      "items": { "type": "string" },
      "const": ["ovs:palinopsia", "ovs:floaters", "ovs:tinnitus", "ovs:glare", "ovs:halo", "ovs:photophobia", "ovs:nyctalopia", "ovs:derealization", "ovs:vertigo", "ovs:peripheral-tremor"]
    },
    "occasional": {
      "description": "Present in a subset of VSS patients. 1.1 adds brain fog, listed as occasional (5-29%) by Orphanet ORPHA:420556",
      "type": "array",
      "items": { "type": "string" },
      "const": ["ovs:diplopia", "ovs:oscillopsia", "ovs:migraine-aura", "ovs:contrast-loss", "ovs:brain-fog"]
    }
  }
}