Investigation of Preservative-Free Ophthalmic Solution in Ocular Dryness

Primary objective ▪ To evaluate the clinical performance of Eyestil SYNFO® as detected by the reduction of keratitis lesions objectified by corneal and conjunctival staining tests with fluorescein using the National Eye Institute (NEI) scale after 1 month of treatment compared to baseline. Secondary objectives * To evaluate the mean change of the corneal and conjunctival staining score with fluorescein using the NEI scale after 14 days of treatment and after 3 months of treatment compared to baseline. * To evaluate conjunctival hyperemia index assessed by OCULUS Keratograph after 14 days, 1 month and 3 months of treatment compared to baseline. * To evaluate the tear film stability as objectified by the tear film break-up time (TFBUT) test after 14 days, 1 month and 3 months of study treatment initiation compared to baseline. * To evaluate the changes on the Best Corrected Visual Acuity (BCVA) measured by the "Early Treatment Diabetic Retinopathy Study" (ETDRS) after 14 days, 1 month and 3 months of study treatment initiation compared to baseline. * To compare patients reported outcomes with baseline, using specifically: * the patient's reported Symptom Assessment questionnaire iN Dry Eye (SANDE) after 1 and 3 months of treatment; * the patient's Dry Eye-Related Quality-of-Life Score (DEQS) questionnaire after 1 and 3 months of treatment. * To evaluate the safety and compliance of the medical device throughout the entire study period.