A sterile, underwater eye solution consisting of about 0.05% to 0.5% (weight / weight) of a ketone in a carrier solution or a salt acceptable on its drug, In kitosano n - (acetylene butene), the free endosulfan content is 80 mm / g polymer to 280 mm / g polymer. Containers containing this eye solution and containers for use in the prevention or treatment of dry eye syndrome or dry eye symptoms and / or symptoms. Claim 6: a surface solution based on any of the above claims,The characteristics also include at least one precursor selected from boric acid and its salts, citric acid, acetate, polyethylene glycol, nitrous oxide EDTA, manitol, sorbitol, glisterol, sodium chloride, methamphetamine, hydroxypropylmethylcellulose, polyvinyl chloride and other components, Polyethylene alcohol, lubricant,A salt or mixture of hyaluronic acid and its drugs acceptable. Claim 11: the container is characterized by the provision of an eye solution in accordance with any of the above requirements in an essentially oxygen free environment. Claim 12: the container according to claim 11, which is characterized in that the container includes the first container containing eye solution and the second container containing the first container.Una solución oftálmica acuosa estéril que comprende de aproximadamente 0,05% a aproximadamente 0,5% (peso/peso) de N-(N-acetilcisteinil)quitosano o una de sus sales farmacéuticamente aceptables en una solución portadora, en donde el N-(N-acetilcisteinil)quitosano tiene un contenido de grupos tiol libres en una cantidad de 80 mmol/g de polímero a 280 mmol/g de polímero. Contenedor que contiene dicha solución oftálmica, así como también al uso de ésta en la prevención o tratamiento del síndrome del ojo seco o de los signos y/o síntomas de ojos secos. Reivindicación 6: La solución oftálmica de acuerdo con cualquiera de las reivindicaciones anteriores, caracterizada porque comprende además al menos un excipiente seleccionado de entre el grupo consistente en
