Kala motia is a disease called Glaucoma, which is usually hereditary. This is treatable by eye drops or surgery but not curable. Eye-ball has certain pressure to keep it in shape like a football or a tyre. When this pressure is more than normal it affects nutrition of the eye and affects field of vision. This field of vision needs to be monitored to assess the extent of damage due to Kala motia and also to check the effectiveness of the treatment. VFA is visual field assessment. You must keep on with the recommended treatment and follow up by the eye specialist otherwise the disease can affect vision in the long run. Get your own blood relatives checked up as well, as early detection and treatment can prevent vision loss.