Circle contact lens
A circle contact lens, also known as a big eye contact lens and circle lens, is a cosmetic (non-corrective and decorative) contact lens that makes the eye's iris appear larger. It has become a trend throughout East, South and Southeast Asia and is largely produced in Japan, South Korea and China. Some circle lenses are made in toric prescriptions to correct astigmatism and are available from several online retailers. 
Circle lenses make one's eyes appear larger and come in a variety of colors and effects. They have been around since 2004 and are very popular in countries such as South Korea, Japan, Taiwan and China.
The diameter of regular contact lenses that are sold in the United States are on average 14mm–16mm. Similar to the diameter of regular contact lenses, circle lenses have no more than 15mm (diameter) since larger sizes would be harmful to the eyes at daily wear. When the diameter of the circle lens is described as 16mm or 18mm, it is only the provided visual effect of the circle lens. The difference between the two types of lenses is that circle lenses are tinted not only in areas that cover the iris of the eye, but also prominently in the extra-wide outer rim of the lens. The result is the appearance of a bigger, wider iris, with a limbal ring, and create an illusion of large eyes.
The optical zone in the middle is transparent and it is large enough to provide clear vision. When big eye contacts first launched, they were only available in yearly disposable format, but as the trend spread, these lenses are now available as dailies, biweeklies and monthlies. The lenses are popular among teenagers and young adults. Many people consider circle lenses to be a fashion accessory rather than a medical device. In Hong Kong, many young female models wear them as popular fashion icons.
In Asia circle contact lenses can be bought in some stores and are imported from manufacturing countries such as South Korea to nations such as Thailand, China, Malaysia, Japan, Nepal, India, Singapore, Taiwan and the Philippines. They can be purchased without a prescription (0.00 or plano) or with prescription. Their legality in the West varies with the local laws, and in the United States they are currently classified as a medical device and are not legal for sale without a valid prescription.
Adverse effects have been reported: "Cosmetically tinted contact lenses increase ocular higher-order aberrations and worsen contrast sensitivity under both photopic and mesopic conditions. Increases in higher-order aberrations are responsible for decreased contrast sensitivity under the photopic condition. Tinted contact lens wearers should be sufficiently informed about the possible reduction in optical quality of the eye and quality of vision." However, a meta-analysis reported that cosmetically tinted lenses appear to be safe when properly prescribed and when used correctly.
Concerns with these lenses in the United States arise from people buying lenses without consulting their optometrists, which could result in lenses that do not fit the individual's eyes properly.
In the United States decorative, non-corrective contact lenses are considered medical devices by the Food and Drug Administration (FDA) and sale and marketing of such devices require market clearance by the FDA and a valid prescription from a medical professional. Devices that have not been cleared by the FDA may be subject to seizure by US Customs.
Korean contact lens companies Geo Medical Inc. and Migwang Contact Lens (operating under the brand name Clearlab in the US) have been approved by the FDA for sale in the United States. Circle lenses manufactured in Korea are under the approval and guidelines of the Korean Food and Drug Administration (KFDA). Acuvue, an American subsidiary of Johnson & Johnson (J&J), has a line prescription of 1-Day circle lenses available only in Far East markets.
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