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Base curve radius (BCR) or simply base curve (BC) is the measure of an important parameter of a lens in optometry. On a spectacle lens , it is the flatter curvature of the front surface. On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius ( BCOR ).
The Envy Spectre XT is a 13-inch ultrabook released in 2012 and removed from HP's 2013 Envy lineup. It weighs 3 pounds (1.4 kg) and includes a 1366 × 768 display, buttonless multi-touch touchpad, and solid-state drive. The HP Envy Spectre XT runs Windows 7. [34] Envy Spectre XT Pro Same model with Tpm module and windows 7 Pro. [35]
Artist's impression of Leonardo's method for neutralizing the refractive power of the cornea. Leonardo da Vinci is frequently credited with introducing the idea of contact lenses in his 1508 Codex of the eye, Manual D, [9] wherein he described a method of directly altering corneal power by either submerging the head in a bowl of water or wearing a water-filled glass hemisphere over the eye.
In the US market, soft contact lenses are approved by the US Food and Drug Administration. [2] The American Optometric Association published a contact lens comparison chart called Advantages and Disadvantages of Various Types of Contact Lenses on the differences between them. [3] These include: soft contact lenses; rigid gas-permeable (RGP ...
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Following HP's acquisition of Compaq in 2002, this series of notebooks was discontinued, replaced with the HP Pavilion, HP Compaq, and Compaq Presario notebooks. The OmniBook name would later be repurposed for a line of consumer-oriented notebooks in 2024, replacing the old Pavilion and Spectre series of notebooks.
HP OmniBook X (2024) The HP OmniBook X (14-fe000) is a laptop first announced in May 2024 as the first model of the current OmniBook line. Introduced as a next-generation AI-powered PC, it weighs at about 2.97 pounds and measures 12.32 × 8.8 × 0.56 inches in the front and 12.32 × 8.8 × 0.57 inches in the rear.
The HP Pavilion dv4 is a model series of laptops manufactured by Hewlett-Packard Company that features a 14.1" diagonal display. The HP Pavilion dv5 features a 15.4" and the HP Pavilion dv7 a 17" display.