The pterygium is an abnormal growth of tissue on the surface of the eye that can affect your vision depending on the degree of invasion, the discomfort that the pterygium presents in addition to altering its aesthetics is burning, irritation, foreign body sensation, tearing and in many cases eye pain. Pterygium occurs more easily in people who are in constant outdoor activity such as: farm workers, construction workers, those who are constantly exposed to dust. The treatment given to the pterygium depends on the degree of invasion in which it is found, but in general, its treatment is always surgical. OBJECTIVE: to determine the refraction of the patient, her degree of pterygium, identifying its main causes, prevention and treatment. METHODOLOGY: An eye examination was performed through which we examined a 46-year-old female patient who presented discomfort such as: tearing, irritation and foreign body sensation in the right eye, in addition to presenting a decrease in visual acuity, for approximately 5 years. CONCLUSION: in conclusion we have the diagnosis of a III degree pterygium, caused by continuous exposure to sun and dust, which was referred to an ophthalmologist to follow up on their respective treatment, which is mostly surgical and their visual decrease is for presbyopia caused by his age, for which he was prescribed framed glasses.The pterygium is an abnormal growth of tissue on the surface of the eye that can affect your vision depending on the degree of invasion, the discomfort that the pterygium presents in addition to altering its aesthetics is burning, irritation, foreign body sensation, tearing and in many cases eye pain. Pterygium occurs more easily in people who are in constant outdoor activity such as: farm workers, construction workers, those who are constantly exposed to dust. The treatment given to the pterygium depends on the degree of invasion in which it is found, but in general, its treatment is always surgical. OBJECTIVE: to determine the refraction of the patient, her degree of pterygium, identifying its main causes, prevention and treatment. METHODOLOGY: An eye examination was performed through which we examined a 46-year-old female patient who presented discomfort such as: tearing, irritation and foreign body sensation in the right eye, in addition to presenting a decrease in visual acuity, for approximately 5 years. CONCLUSION: in conclusion we have the diagnosis of a III degree pterygium, caused by continuous exposure to sun and dust, which was referred to an ophthalmologist to follow up on their respective treatment, which is mostly surgical and their visual decrease is for presbyopia caused by his age, for which he was prescribed framed glasses.El pterigión es un crecimiento anormal de tejido sobre la superficie del ojo que puede afectar su visión según el grado de invasión, las molestias que presenta el pterigión además de alterar su estética es ardor, irritación, sensación de cuerpo extraño, lagrimeo y en muchos casos dolor ocular. El pterigión se presenta con mayor facilidad en personas que están en una constante actividad al aire libre como: trabajadores del campo, construcciones, los que están constantemente expuesto al polvo. El tratamiento que se da al pterigión depende del grado de invasión en el que se encuentre pero por lo general siempre su tratamiento es quirúrgico. OBJETIVO: determinar la refracción de la paciente, su grado de pterigión, identificando sus principales causas, prevención y tratamiento. METODOLOGIA: se realizó una exploración ocular mediante el cual examinamos a una paciente femenina de 46 años que presenta molestias como: lagrimeo, irritación y sensación de cuerpo extraño en el ojo derecho, además de presentar una disminución de su agudeza visual, por aproximadamente 5 años. Mediante la exploración con lámpara de hendidura observamos un pterigión de III grado, y mediante el autorrefractómetro valoramos su agudeza visual. CONCLUSION: como conclusión tenemos el diagnostico de un pterigión de III grado, causado por la continua exposición al sol y al polvo, el cual fue remitido a un oftalmólogo para dar seguimiento a su respectivo tratamiento que en su mayoría es quirúrgico y su disminución visual es por la presbicia causada por su edad, el cual se le prescribió lentes de montura.