A 30 year old woman had a gradual decrease of visual acuity since the last 3 years. Now she has a disability due to very low vision. What’s the diagnosis?

The key is D. Retinitis pigmentosa. [This is not angle closure glaucoma as angle closure glaucoma occurs usually after the age of 50; In open angle glaucoma visual loss is not evenly gradual rather occurs a bit suddenly at its later part. It is not cataract as cataract occurs usually in elderly. In macular degeneration near blindness does not occur rather causes inability to identify face or cannot read small prints; otherwise peripheral vision is not that depressed. In keratitis will be pain, redness, photophobia and vision is ok].