The duration of blindness caused by conical cornea varies from person to person, usually more than a year, but the exact duration is related to the patient’s condition. Conical cornea is a condition in which there is a limited cone-shaped protrusion in the center of the cornea, which thins the corneal stroma, and as the disease progresses, the patient may experience a loss of vision. As the disease progresses, patients may experience vision loss. As cone cornea continues to develop, patients may experience corneal perforation, which can severely impair vision and even lead to blindness. Blindness usually occurs more than a year after the onset of the disease, but the exact timing depends on the patient’s condition. If cone cornea patients are treated in a timely manner, they usually do not go blind. Early-stage conical cornea patients can wear frames to improve their vision, or choose rigid gas permeable corneal contact lenses to correct their vision. When the patient’s condition is serious, surgical treatment, such as corneal transplantation, is feasible to improve vision. It is recommended that patients with conical cornea should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.