Scotoma (alteration of central vision)
The patient will perceive a spot at the center of the visual field; this can vary from blurring to an area that is completely black; the patient will find it difficult to read, write, recognize faces etc. The spot is more or less circular in shape and will be in a fixed position (its position does not change when the patient looks in a different direction); it will cause considerable distress because of its central position. When the patient is trying to read, the spot will cover and hide the words; if the spot is very large, it can completely cover the face of the person in front of the patient, making it very difficult to recognize him/her.