What is the difference between monofocal and multifocal intraocular lenses?

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What is the difference between monofocal and multifocal intraocular lenses?
A monofocal intraocular lens is generally designed to focus at one distance. Multifocal lenses are designed to reduce reliance on glasses at multiple distances. However, some multifocal IOLs can cause halos or reduced contrast sensitivity, so they are not suitable for everyone.

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57	What tests are used to diagnose retinal diseases? Common tests include a dilated retinal examination and optical coherence tomography (OCT). Depending on the condition, we may also use ultra-widefield retinal imaging, ocular ultrasound, or fluorescei...
56	Can you assess my risk of glare and halos at night before surgery? Preoperative testing can identify factors that may contribute to glare and halos, including corneal shape, higher-order aberrations, pupil size, and dry eye. We use these findings to ｓelｅct and plan a...
55	Which vision correction procedure is right for me—LASIK, LASEK, or implantable lenses? The best option depends on the results of a comprehensive eye examination. We assess your corneal thickness and shape, degree of nearsightedness and astigmatism, dry eye symptoms, pupil size, and reti...
54	When is it safe to fly after retinal detachment surgery? The timing depends on the type of bubble placed inside your eye. Flying while any air or gas remains can cause the bubble to expand as cabin pressure decreases, leading to a dangerous rise in eye pres...
53	What eye conditions and procedures do you treat? We provide consultations and treatment for vision correction procedures such as LASIK, LASEK, and implantable lenses; enhancement surgery after previous vision correction; cataract surgery and IOL exc...
52	What are your opening hours and closing days? According to the clinic’s published schedule, we are open Monday, Tuesday, Thursday, and Friday from 9:30 a.m. to 6:30 p.m., and Saturday from 9:00 a.m. to 4:00 p.m. Lunch break is from 1:00 p.m. to 2...
51	Can I have an examination now and decide about surgery later? Of course. You can have your eyes examined, review your options, and take time to decide whether to proceed with surgery. In non-urgent cases, monitoring or nonsurgical treatment may be appropriate. U...
50	Can glare and halos that started after LASIK be treated? Additional treatment may be considered if glare and halos are related to an irregular cornea or the position of the original treatment zone. However, dry eye, pupil size, or changes in the natural len...
49	. Will I still need glasses after cataract surgery? That depends on the type of intraocular lens (IOL) implanted and the condition of your eyes. A monofocal IOL is generally designed to provide clear vision at one focal distance, while some multifocal ...
48	Does an epiretinal membrane always need to be removed? Not necessarily. If blurred or distorted vision is mild and OCT scans show little change, observation may be appropriate. Surgery may be considered if symptoms begin to interfere with daily activities...
47	Can a macular hole be treated with eye drops or injections instead of surgery? A full-thickness macular hole often requires surgery, usually involving vitrectomy and a gas bubble. Treatment depends on the size and duration of the hole and the condition of the vitreous. Some earl...
46	If there is bleeding inside my eye, will I need surgery right away? It depends on what caused the bleeding and the condition of the retina. In some cases, vitreous hemorrhage can be monitored while the blood clears. However, prompt evaluation and possibly surgery may ...