Aim of this study is to investigate the administration effects of the combination of citicoline 40mg/ml and nicotinamide 15mg/ml oral solution (Kron®) on short term improvement in inner retinal function, bioelectrical activity of the visual cortex and visual function.

Prospective, masked, randomized placebo-controlled study to evalute the offect of the oral solution Kron® (citicoline 40mg/ml and nicotinamide 15mg/ml) on patients with a diagnosis of open angle glaucoma and risk of glaucoma progression.

Glaucomatous patients with a diagnosis of open angle glaucoma and risk of glaucoma progression who meet the study criteria will be enrolled and randomly assign to the following two arms:

1. Treatment group (TG): 20 patients will receive Citicoline 40 mg/ml + Nicotinamide 15 mg/ml oral solution for 3 months (10 ml/day)
2. Control group (CG): 10 patients will be evaluated as control

Once recruited, a clinical evaluator will perform a comprehensive ophthalmologic evaluation at baseline, week 6 and week 12. The following examinations will be done in the following sequence:

• Visual acuity
• Slit lamp evaluation
• PERG
• PEV pattern
• Tonometry
• Visual field
• Optical Coherence Tomography
• Dilated Fundus examination

Inclusion Criteria:

• glaucomatous patients with moderate visual field loss, MD ranging from -6 dB and -12 dB, and risk of progression
• controlled intraocular pressure
• at least 3 previous visual field examinations.

Exclusion Criteria:

• angle closure glaucoma and secondary open angle glaucoma
• refractive error outside +2D and -6D
• ophthalmic surgery 6 months before the recruitment
• presence of cataract or other conditions that could affect results of perimetry or electroretinography
• treatment with supplements in any form with a demonstrated or presumed neuroprotecting/neuroenhancing effect in the last six months
• presence of other ocular or systemic diseases that could affect results of perimetry or electroretinography.