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The inability to see the sides (no field of vision) is called TUBULAR VISION or tunnel vision
The commonest cause at this age / and that too in association with NIGHT BLINDNESS
is due to RETINITIS PIGMENTOSA
- unless proved otherwise.
Of course, there are other causes for tubular vision. So is night blindness. But the combination is characteristic.
You must be examined, investigated and followed up by an eye specialist (Ophthalmologist) - that too an exclusive eye hospital or in a multi-speciality tertiary care centre