Signs and symptoms: Mild internal and external cryptorchidism in children does not cause eye discomfort, while high obliquity causes eye discomfort in vertical cryptorchidism, and rotational cryptorchidism causes obvious eye and general discomfort. The symptoms of cryptorchidism are also related to the general health and mental state. The following symptoms often appear in cryptorchidism: 1. headache, eye pain and photophobia often appear after long vision, which is caused by eye muscle fatigue due to the continuous use of neuromuscular reserves; 2. blurred handwriting or overlapping, serial when reading, sometimes intermittent diplopia, intermittent strabismus, if the monocular vision instead of feeling clear, energy-saving, etc., and even binocular visual disorders occur; 3. poor stereo perception, unable to 3. Poor stereoscopic perception, unable to accurately determine the position and distance of spatial objects. Cryptorchidism may also present with neuro-radiological symptoms such as nausea, vomiting, insomnia, and conjunctival and lid margin congestion.