in this paper, we investigate various kinds of extensions of twin-good rings. moreover, we prove that every element of an abelian neat ring r is twin-good if and only if r has no factor ring isomorphic to z2  or z3. the main result of [24] states some conditions that any right self-injective ring r is twin-good. we extend this result to any regular baer ring r by proving that every element of a...

PURPOSE To evaluate the safety and efficacy of intrastromal corneal ring segments (ICRS) implantation followed by same-day topography-guided photorefractive keratectomy (PRK) and ultraviolet-A/riboflavin collagen cross-linking (CXL) in patients with low to moderate keratoconus. METHODS Patients with low to moderate keratoconus and contact lens intolerance were included in the study. All patie...

PURPOSE To prospectively evaluate intracorneal ring segment (ICRS) implantation on quality of life (QoL) of patients with keratoconus changes and identify factors responsible. METHODS Sixty-nine eyes of 42 keratoconus patients were implanted with the Keraring (Mediphacos, Belo Horizonte, Brazil). Best corrected visual acuity (BCVA), refraction, and steep keratometry were analyzed 3 months and...

There are indications that complement activation may be involved in inflammatory processes of the cornea. To investigate the role of the complement system in experimental keratitis, rats were depleted of their plasma complement by treatment with cobra venom factor (CVF). intraperitoneal injection of CVF resulted in undetectable complement serum activity for 6 days when measured by a hemolytic a...

BACKGROUND Peeling skin syndrome (PSS) is a rare genodermatoses of probable autosomal recessive inheritance. In Saudi Arabia, consanguinity of parents is common and consequently the occurrence of familial disease, including that of the skin, is not uncommon. METHODS To characterize the clinical and pathological features of PSS in Saudi Arabia, we reviewed the medical records and clinical phot...

PURPOSE To assess the safety, predictability, and effectiveness of Keraring intrastromal corneal ring segments (ICRS) insertion assisted by femtosecond laser and corneal collagen cross-linking (CXL) for keratoconus correction. PATIENTS AND METHODS In this prospective, noncomparative, and interventional case series, 160 eyes of 100 adult keratoconus patients with poor best-corrected visual acu...

A hydrogel intracorneal lens for refractive keratoplasty must have predictable and stable optics when implanted in the corneal stroma. A series of experiments was performed to evaluate the hydrogel hydration stability when in the corneal stromal environment. Hydrogel ICLs of 54%, 63%, 66% and 71% water content showed no loss of hydration (by weight) after one week in the rabbit corneal stroma. ...

the concept of fuzzy soft γ-ring is introduced; and some properties of fuzzy soft γ-rings are given. then the definitions of fuzzy soft γ-ideals are proposed and some of their theories are considered.