Can cataracts be prevented? Many patients are concerned about whether cataracts can be prevented. In fact, common cataracts are mainly age-related cataracts, which means that as we age, the cortex of the crystal changes, and thus cataracts develop. Although there are studies that prove that the alteration of the crystal is related to UV intensity and malnutrition, increasing age is still the most important factor in the alteration of the crystal. So, in this sense, there is no way to prevent age-related cataracts. Can medications control cataract progression? Some patients who are diagnosed with cataracts would very much like to be able to control the progression of the cataract with medications, however, this is not possible. I have also seen many advertisements claiming that many drugs can slow or stop the progression of cataracts. In fact, it has been proven through rigorous clinical studies that drugs do nothing to control cataract progression. We hope that patients will not spend too much money on such products, whether they are various eye drops or eye patches. What level of cataract is better to have surgery? Cataracts can affect the quality of life of patients at a certain level, and patients are always concerned about when it is better to have cataract surgery. In the past, it was thought that cataracts could only be operated when they were mature, but this view is no longer suitable for the current medical technology. Nowadays, cataracts are treated with ultrasound emulsification technology. If patients wait until the cataract is very serious and the nucleus of the lens is too hard before having surgery, it is usually more difficult to operate and the inflammatory reaction after surgery will increase, which is not good for patients. Nowadays, the timing of cataract surgery has been advanced, but to what extent it is advanced is based on many factors. One of the most important factors is that cataracts seriously affect the patient’s quality of life, and surgery is generally considered when the patient’s corrected visual acuity is below 0.6. In a few cases, the patient’s visual acuity can still reach 0.8 or even 1.0 when measured with a visual acuity meter, but the uneven and cloudy crystal cortex has seriously affected the quality of vision (note that visual quality and visual acuity measured by a visual acuity meter are not the same concept), or the patient attaches great importance to visual perception due to certain jobs, in such cases, cataract surgery can be considered after a full assessment of the need for surgery. In conclusion, the timing of cataract surgery should take into account the degree of cataract, the impact on visual quality and the patient’s requirements.