They are notorious for their negative impact on the corneal endothelial lining, which is vital for maintaining a healthy clear cornea. Iris-fixated PIOLs, attached by claws to the mid-peripheral iris by a technique called enclavation. It is believed to have a lesser effect on corneal endothelium. The main complication with this type is their tendency to cause endothelial cell reduction. Sulcus-supported PIOLs, placed in the posterior chamber in front of the natural crystalline lens. This type of PIOLs is gaining more and more popularity. They have special vaulting so as not to be in contact with the normal lens. The main complication with older versions was a small possibility of cataract formation. Blue-light filtering IOLs
Blue light filtering IOLs filter the UV and high-energy blue light present in natural and artificial light, both of which can cause vision problems; however too much filtering of blue light can increase depression, especially in the winter months (SAD). The trademarked "Natural Yellow" material is available in three hydrophilic IOLs. Dr. Patrick H. Benz of Benz Research and Development created the first IOL material to incorporate the same UV-A blocking and violet light filtering chromophore thats present in the human crystalline lens in order to attempt to protect the retina after cataract extraction of the natural crystalline lens. A Cochrane Review found little evidence of important differences between blue‐light filtering and non‐blue‐light filtering lenses for protecting the macula (back of the eye) after cataract surgery. This was due to studies being too small and too short‐term to provide reliable results.
Ataque de nervios (Spanish pronunciation: [aˈtake ðe ˈneɾβjos], also known as "Puerto Rican syndrome") is a psychological syndrome mostly associated, in the United States, with Spanish-speaking people from the Caribbean, although commonly identified among all Iberian-descended cultures. Ataque de nervios translates into English as "attack of nerves", although it is used in its common cultural form to refer to a specific pattern of symptoms, rather than being a general term for feeling nervous. The condition appears in Appendix I of the revised fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR) as a culture-bound syndrome. Classification
Despite comparisons to panic attacks, investigators have identified ataque de nervios as a separate syndrome with measured differences in anxiety sensitivity, and types of attacks. Marlene Steinberg, an Associate Research Scientist at Yale University stated that because it is similar to Multiple Personality Disorder, some Hispanics may be misdiagnosed with an ataque de nervios syndrome instead. Symptoms
Reported aspects of the syndrome include uncontrollable screaming or shouting, crying, trembling, sensations of heat rising in the chest and head, dissociative experiences, and verbal or physical aggression. The reaction is usually associated with a stressful event relating to the family, although it is not specifically defined as arising from such occurrences. History
Ataque de nervios was first mentioned after studies were conducted by US psychiatrists who focused on healthcare for Hispanic populations, particularly individuals who were Puerto Rican and living in the United States . See also
Dissociative identity disorder
Nervous breakdown
Susto
Women on the Verge of a Nervous Breakdown
Hwabyeong
Posttraumatic stress disorder


== References ==