<unk>  are constructed with the upper portion of the frame thicker than the lower, simulating eyebrows, or otherwise drawing attention to the wearer's natural<unk> . The most common means of construction is for the upper portion of the frame (the "brows" or "caps") and temples to be made of plastic, with the remainder of the frame (the bridge and eyewires, or "chassis") to be made of metal. The chassis inserts into the brows and is held in place by way of a series of screws. For a period in the 1960s, numerous models emerged in which the brows were constructed from aluminium; following the style's resurgence in the 2000s,<unk> s made wholly out of one type of metal with less pronounced brow portions became popular. Monobrowlines Monobrowlines are a variant of<unk> s in which the bridge is contiguous with the caps, creating a solid, unbroken line across the top of the frame. The style dates back to the Shuron Stag, a<unk>  prototype, which enjoyed some brief popularity before being replaced by the Ronsir as Shuron's flagship frame. The original stag had no metal chassis: the lenses were mounted directly to the brow caps via two sets of screws. Although the style was never popular in the United States, it became particularly fashionable in Europe and England in the 1960s as part of Amor's Spotlite line. The modern monobrowline originated in the 1980s, as part of an effort by Bausch and Lomb to diversify their Ray-Ban sunglass collection with the Wayfarer Max, a fusion of the then-popular Wayfarer and Clubmaster sunglass models. The style proved unpopular and was quickly phased out. The monobrowline design was resurrected by a variety of manufacturers in the 2010s (chiefly Oakley) after<unk> s returned to popularity. Unlike its tenure in the 1980s, monobrowlines proved to be a popular variant among eyeglass wearers in the 2010s.
Browline glasses
Windsor glasses
Pinhole glasses
Trifocal lenses
Adjustable-focus eyeglasses
Ocular prosthesis
Corrective lens
Bionic contact lens