Entropion is caused by weakness of the lower lid retractor muscle, loss of contraction of the orbital septum and lower lid skin to hold the lid orbicularis muscle, and lack of adequate support behind the eyelid in older adults with reduced orbital fat. Scarring lid entropion can occur in both upper and lower lids. It is caused by scarring of the lid conjunctiva and lid plate. Examination: 1. Eyelid examination is a type of ophthalmologic examination and is more important for those with refractive error (abnormal vision in both eyes without correction, or when correction is incorrect). Abnormal findings: ① Any congenital abnormalities of the eyelids, such as eyelid defects, narrow lid fissures, ptosis, etc. (2) Abnormalities of the eyelid skin, such as redness, swelling, heat, pain, subcutaneous emphysema, or masses. (3) Abnormalities in the position of the eyelid, such as comparison of the width of the bilateral lid fissures and the presence or absence of lid inversion. ④Abnormalities of the lid margin and eyelashes. Refractive error (abnormal visual acuity in both eyes when uncorrected or incorrectly corrected). The examination procedure is usually done by visual and palpation in natural light. Observation under direct hand light or slit lamp, for which examination should pay attention to binocular contrast. 2, corneal fluorescence staining corneal fluorescence staining (fluorescein) is a common complication in the process of contact lens wear. Moderate to severe corneal epithelial staining can lead to a series of serious consequences such as corneal pathogen infection, corneal ulceration and perforation. Abnormal findings: ① soft green staining at the corneal and conjunctival breaks, but no staining at the epithelium intact. ② If there is a corneal fistula, light pressure on the eye after ordering fluorescein, the corneal surface can be seen covered with yellow-green fluorescein, while at the fistula there is fluid outflow, like a clear spring outflow. The test is performed on patients with corneal or conjunctival epithelial damage or ulcers. Procedure: ① Apply a small amount of fluorescein solution to the conjunctival sac with a glass rod. ②Place the fluorescein solution in an eyedrop bottle and drop it directly into the conjunctival sac. ③Pump the fluorescein solution into the syringe and drop it into the conjunctival sac.