Retinitis pigmentosa

Retinitis pigmentosa primarily affects the peripheral retina resulting in tunnel vision

Features

• night blindness is often the initial sign
• tunnel vision due to loss of the peripheral retina (occasionally referred to as funnel vision)
• fundoscopy: black bone spicule-shaped pigmentation in the peripheral retina, mottling of the retinal pigment epithelium

Associated diseases

• Refsum disease: cerebellar ataxia, peripheral neuropathy, deafness, ichthyosis
• Usher syndrome
• abetalipoproteinemia
• Lawrence-Moon-Biedl syndrome
• Kearns-Sayre syndrome
• Alport's syndrome

Wikipedia