Can retinitis pigmentosa be detected by an eye test?

"The types of RP which cause loss of central vision become apparent through an inability to read a test card (eye test chart), but peripheral loss, or loss of side vision, is not so obvious and a person may be able to read an optician’s test card for many years.

The condition is best detected through an eye test or examination by an optometrist (optician) or ophthalmologist (eye doctor). By looking through the front of the eye with a piece of equipment called an ophthalmoscope, an optometrist or ophthalmologist can see clearly to the back of the eye. Normally they would see an orange-coloured area called the fundus. When the patient has RP, the orange surface is broken by black or brown clumps of pigment.

Other tests are available which measure the area of visual field which is still useable and the ability to adapt to low light levels."