Eyes look smaller and smaller, usually due to the following reasons: 1. Due to eyelid skin laxity. This is common in middle-aged and elderly people. As we age, the skin in the upper eyelid area becomes less elastic and less tense, and gradually sags under the influence of gravity, partially obscuring the eyeball and making the eyes look smaller, and gradually worsening with age. 2. Due to ocular muscle weakness. This is a disease caused by an autoimmune reaction that causes the muscle strength of the levator muscle to gradually decrease so that the upper eyelid cannot lift properly, triggering a narrowing of the width of the lid fissure and making the eyes look smaller in appearance. If not treated promptly, the condition will gradually worsen, making the eyes smaller and more severe.3. Due to ocular atrophy. This is common in serious eye diseases such as old retinal detachment, where the eye wall loses support and gradually atrophies and becomes smaller because of long-term low intraocular pressure.