Table 1 Diagnostic criteria for retinitis pigmentosa (RP) [8]
From: Prevalence of inherited retinal diseases in a large Egyptian cohort
Diagnosis is based on Either: Night blindness + ophthalmoscopic evidence or Electroretinogram (ERG), OR Ophthalmoscopic evidence + Visual field (VF) or ERG evidence, OR VF defects + ERG | |
|---|---|
Night blindness | Anamnestic or demonstrated by dark adaptometry |
Ophthalmoscopic evidence | Narrow retinal arterioles, diffuse and widespread atrophy of the retinal pigment epithelium and/or choroid, bony spicules or granular hyperpigmentation, abnormality of fundus reflexes and/or optic nerve head pallor |
Visual field defects | Peripheral or mid-peripheral |
Dark-adapted electroretinogram (ERG) | Severe reduction or extinction |