Essential DITA optical styles. ASH ( ) and BUCKEYE ( ) set the stage for the introduction of OKU. an ultra-lightweight Japanese acetate front frame with titanium press temples with two-tone coloration toting a crown panto with an angular profile. Engaging in similar design details. OKU's classic versatility remains a consistent pulse in DITA's optical collections. OKU was designed from the heart of this multi-spirited collection. as an offering of an alternative optical style to satisfy the needs for the individual looking to elevate their everyday essentials.