{"_id": "0", "text": "Does the effect wear off with age?", "metadata": {"url": "http://web.archive.org/web/20190803095849id_/https://www.allaboutvision.com/visionsurgery/faq-lasik-permanent.htm_p0", "context": [{"role": "user", "content": "What is a good age to get LASIK?"}, {"role": "assistant", "content": "Generally, the perfect candidate for LASIK is someone between the ages of 20 and 40."}, {"role": "user", "content": "Give me a short description of the procedure."}, {"role": "assistant", "content": "During LASIK eye surgery, an eye surgeon creates a flap in the cornea (A) \u2014 the transparent, dome-shaped surface of the eye that accounts for a large part of the eye's bending or refracting power. Then the surgeon uses a laser (B) to reshape the cornea, which corrects the refraction problems in the eye (C)."}, {"role": "user", "content": "What are its benefits?"}, {"role": "assistant", "content": "Improved vision. Studies have shown that about 95% of patients who receive LASIK surgery achieve uncorrected visual acuity (UCVA) of at least 20/40 and 85% achieve 20/20 vision or better."}, {"role": "user", "content": "What are the risks?"}, {"role": "assistant", "content": "Dry eyes, glare, halos, and starbursts are all possible side effects of LASIK surgery."}, {"role": "user", "content": "Describe experiences of some people who had it done."}, {"role": "assistant", "content": "Many developed symptoms within six months, such as seeing starbursts (30.3 percent), halos (26.2 percent), and double images (5.2 percent)"}, {"role": "user", "content": "Are there any good alternatives to it?"}, {"role": "assistant", "content": "LASEK (laser-assisted subepithelial keratomileusis): While LASIK focuses on corneal sculpting, LASEK focuses on the very top layer, or epithelium, of the cornea."}, {"role": "user", "content": "What is its success rate?"}, {"role": "assistant", "content": "The latest research reports 99 percent of patients achieve better than 20/40 vision and more than 90 percent achieve 20/20 or better. In addition, LASIK has an unprecedented 96 percent patient satisfaction rate \u2013 the highest of any elective procedure."}, {"role": "user", "content": "Once it's done, what kind of precautions do I need to take?"}, {"role": "assistant", "content": "1 to 2 weeks post LASIK: You can usually begin exercising within a week after LASIK surgery, but you should continue to avoid contact sports for at least a month. Wear sunglasses when out in the sun to protect your eyes from the ultraviolet light, and use the provided eye drops to minimize dry eyes."}]}}
{"_id": "1", "text": "How is it made?", "metadata": {"url": "http://web.archive.org/web/20191215223245id_/https://www.everydayhealth.com/diet-nutrition/diet/tofu-how-its-made-its-good-you-how-prepare-it/_p0", "context": [{"role": "user", "content": "What is tofu exactly?"}, {"role": "assistant", "content": "Made from soybeans, tofu is also known as bean curd."}]}}