13 research outputs found
Removability of a small aperture intracorneal inlay for presbyopia correction.
PURPOSE: To evaluate the safety of the corneal inlay
removal procedure and the reversibility of visual acuities,
corneal topography, and corneal biomicroscopy
changes in a series of cases.
METHODS: Ten cases implanted with one of three versions
of the AcuFocus Kamra Inlay (ACI 7000, 7000T,
and 7000PDT; AcuFocus, Inc., Irvine, CA) were followed
for a minimum of 6 months after corneal inlay removal.
RESULTS: The reason for removal was related to subjective
dissatisfaction with visual symptoms (8 of 10
patients) such as night glare, photophobia, starburst,
blurry vision, and halos. One case of removal was related
to inadvertent thin fl ap and the fi nal case was related
to insuffi cient near vision. Mean uncorrected distance
visual acuity (UDVA) and uncorrected near visual acuity
(UNVA) was 0 ± 0.1 logMAR (Snellen 20/20) and 0.5
± 0.2 logMAR (Snellen 20/40), respectively, preoperatively
and 0.1 ± 0.1 logMAR (Snellen 20/25) and 0.5
± 0.1 logMAR (Snellen 20/63), respectively, 6 months
afte
Follow-up Study of More Than 15 Years of an Angle-Supported Phakic Intraocular Lens Model (ZB5M) for High Myopia: Outcomes and Complications.
The Management of Characteristics of the New Two-layer Rubber Matrix Seals
Rubber seals for closing devices operating in cold climates degrade quickly in aggressive environments at very low temperatures. As a result, leaks and failures occur in the closure devices. Therefore, there is a great need to develop a new model of rubber seals and develop their scientific basis.
The article is devoted to increasing the sealing effect of rubber seals of machines and equipment, including closures, by introducing the anisotropy of the rubber matrix into its structure with control of the characteristics of hard closures obtained from rubber. For this purpose, new models of the gate valve design were obtained and new models of two-layer panel seals based on a modified rubber elastomer matrix are applied to these structures.
For this, a test program is carried out in the form of an analytical trajectory of large, medium and small constant curves in two closed forms based on characteristic deformations to study the anisotropy of matrix deformations. It is found that the eigenvector of the deformation anisotropy of the matrix is not in the load trajectory before it collapses, it arises with a delay. This delay slows down the rate of destruction.
This property of deceleration of the main eigenvector of the deformation anisotropy of the matrix is subjected to a very complex loading of the initial fields, in the latter sections it is also observed in samples No. 2, No. 3, tested along the trajectory of linear loading. This delay slows down the destruction rate.
Thus, the direction of the deceleration property of the main eigenvector can be considered quite common. This leads to an increase in its resistance to wear in a highly aggressive environmen