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Libby Cowen
The Meade 10" LX90 ACF telescope is an extremely versatile, high-resolution GoTo telescope, in a very compact form given the large aperture. With pushbutton controls, automatic locating and tracking of celestial objects, and a wealth of object data at your fingertips in the AudioStar controller, the LX90 will provide hours of enjoyment under the night sky.
The patented Advanced Coma Free (ACF) optics produce impressively flat fields of view with no coma, even out to the edges of larger format cameras or extreme wide angle eyepieces. This makes the ACF system ideal for visual observers and astro-imagers alike. The ACF system also reduces astigmatism and eliminates diffraction spikes. The Ultra-High Transmission Coatings (UHTC) are included as with all Meade ACF optics, yielding maximum image brightness and contrast at the eyepiece or camera sensor. UHTC are specialized multi-layered coatings that are precisely designed to improve the performance of your telescope's optics. You'll see brighter star clusters, more fine detail in nebulae, and additional surface features on planets. Averaged over the entire visible spectrum, total light transmission to the focal plane increases by 15%.
The ACF primary, secondary and corrector plate glass blanks are manufactured in the USA exclusively for Meade. Meade ACF telescopes, including the mounts, are manufactured and assembled in North America.
Interested in astrophotography? Meade ACF telescopes, with their long native focal lengths, are great instruments for photographing planets and the Moon in high-resolution detail with a DSLR or astro camera. And the addition of the optional Meade ACF 0.68x Focal Reducer optimizes any ACF for deep space imaging. This thread-on accessory converts an f/10 ACF into a faster f/6.8 system and transforms an f/8 ACF into a speedy f/5.5 imaging beast! The reducer shortens the long exposure times needed to record faint deep-sky objects by half and expands the field of view by nearly 50%, allowing capture of larger objects in a single frame. Your Meade ACF will become a powerful astrograph capable of capturing jaw-dropping astrophotographs with your DSLR or astronomical CCD or CMOS camera!
The Meade LX90 series differs from the LX85 offerings in several key ways. First and foremost is the style of mounting. The LX90 optical tube sits on top of a dual fork Alt-Az mount, instead of the equatorial (EQ) mounted LX85 series. This style mounting provides an extremely simplified setup, as no polar alignment is necessary! Simply attach the optical tube/fork motor section to the tripod, turn it on, and proceed with the quick and easy star alignment routine build into the AudioStar hand controller. A built in 16-channel GPS receiver also provides location and accurate time, making the alignment procedure fast and extremely accurate.
Of course, ergonomically designed handles on the fork arms make installation quite easy. They're very handy for astronomers who must set up and break down their rig for each observing or imaging session, and ensure a stable and secure grip when holding the telescope during the assembly/disassembly process.
This 10" LX90 model is compatible with the optional Meade X-Wedge which allows for polar alignment of the fork arms, eliminating field rotation in exposures longer than about 5 minutes. If using the telescope for visual use or shorter exposure imaging (lunar/planetary and very short deep-sky exposures), an equatorial wedge is not required.
The LX90 electronics include the advanced AudioStar computer system with a 30,000+ object-library, multiple guided tours, High Precision Pointing capability, and Periodic Error Correction. Precise and quick star alignment is done near effortlessly with the incorporated 16-channel GPS receiver. The drive base control panel has multiple ports including 2x Aux ports, the AudioStar handbox port, and a 12v power input port.
This computerized celestial object locating system plugs into the telescope's handbox port allowing a quick telescope alignment. Once aligned with the sky, the AudioStar is ready to take you to any object in the over 30,000 object database. In addition to GoTo and tracking capability, the AudioStar permits a wide array of fascinating and educational functions such as multiple Guided Tours, digital positional readouts, the ability to link with a PC using optionally available software and cord, and much more.
Designed and manufactured in North America to exacting quality standards, the Meade LX90 series of fork mounted Alt/Az Advanced Coma-Free GoTo telescopes are perfect for the discerning visual astronomer or dedicated astro-imager. The Meade 10" LX90 ACF features an 10" aperture, 2500mm focal length, and f/10 focal ratio with Dual-Fork Mounting. The Ultra High Transmission Coatings (UHTC) and a resolving power of 0.46 arc-seconds provide an improvement in brightness and resolution on everything from star clusters, fine detail in nebulae, to greater surface features on planets. Includes a Series 4000 26mm Super Plssl eyepiece (96x), viewfinder (8x50 optical with crosshair), 1.25" diagonal mirror, and Standard Field Tripod.
Meade Instruments is acknowledged as one of the most innovative and dynamic companies in the telescope market. Known for its groundbreaking telescopic designs, Meade has introduced dozens of improvements over...
The scope of this page is limited to traumatic brain injury in adults (ages 18 years and older). For information about traumatic brain injury in children (ages birth through 21), see ASHA's Practice Portal page on Pediatric Traumatic Brain Injury.
Traumatic brain injury (TBI) is a form of nondegenerative acquired brain injury, resulting from an external physical force to the head (e.g., fall) or other mechanisms of displacement of the brain within the skull (e.g., blast injuries). Consistent with the diagnostic criteria detailed in the Diagnostic and Statistical Manual of Mental Disorders (5th ed.; DSM-5; American Psychiatric Association [APA], 2013), TBI is associated with one or more of the following characteristics:
TBI can cause brain damage that is focal (e.g., gunshot wound) or widespread (e.g., diffuse axonal injury sustained in a motor vehicle accident). Damage can result from a primary injury or a secondary injury (see common classifications of TBI for more details).
Severity of TBI is based on the extent and nature of the injury, duration of loss of consciousness, posttraumatic amnesia (PTA; loss of memory for events immediately following injury), and extent of confusion at initial assessment during the acute phase of the injury (APA, 2013; Centers for Disease Control and Prevention [CDC], 2015).
According to the National Center for Injury Prevention and Control, an estimated cumulative 5.3 million individuals are living with a TBI-related disability in the United States. This represents a prevalence of approximately 2% of the U.S. population (CDC, 2015). Additional data suggest the prevalence of U.S. TBI-related disability after hospitalization to be 3.2 million (Zaloshnja, Miller, Langlois, & Selassie, 2008). Current studies estimate that approximately 775,000 older adults live with long-term disability associated with TBI (Zaloshnja et al., 2008).
Incidence and prevalence rates of TBI vary across clinical and epidemiological studies. These variations are often due to differences in participant characteristics (e.g., ages included), diagnostic classification criteria within and across subtypes (e.g., mild TBI vs. severe TBI), and sources of data (e.g., hospital admissions, emergency room visits, general practitioner visits). Moreover, current statistics do not consider individuals who do not seek medical care. Therefore, these estimates may significantly underestimate the incidence and prevalence of TBI.
Signs and symptoms of TBI vary, depending on the site and extent of injury to the brain, premorbid abilities, and functional domains affected (e.g., physical, cognitive, language, sensory). The effects of TBI can be temporary or permanent, and no two individuals present with the same pattern.
The clinician considers cultural differences that may lead to differences in presentation of certain cognitive measures (e.g., response time, self-monitoring, executive functioning). See ASHA's Practice Portal page on Cultural Responsiveness for more information.
Cognitive control deficits have a unique impact on the linguistic abilities in bilingual and multilingual speakers (Ansaldo & Marcotte, 2007), especially in individuals with frontal lobe and subcortical lesions (Price, Green, & von Studnitz, 1999). The individual's premorbid proficiency in the languages they speak can influence their ability to maintain the target language.
Speech-language pathologists (SLPs) consider variations in narrative structures secondary to cultural and linguistic factors to ensure that a communication difference is not inaccurately diagnosed as a disorder.
Sports-related injuries and explosive blasts/military combat injuries are other leading causes of TBI. Acquiring a brain injury may predispose an individual to additional brain injuries before symptoms of the first have resolved completely; the second impact is more likely to cause brain swelling and widespread damage (Dessy, Rasouli, & Choudhri, 2015). See ASHA's resource on common classifications of TBI.
Speech-language pathologists (SLPs) play a central role in the screening, assessment, and treatment of persons with TBI. The professional roles and activities in speech-language pathology include clinical services (assessment, planning, and treatment), prevention, and advocacy, as well as education, administration, and research. See ASHA's Scope of Practice in Speech-Language Pathology (ASHA, 2016).
Audiologists play a central role in the assessment, diagnosis, and rehabilitation of hearing and vestibular deficits in individuals with TBI. See ASHA's Scope of Practice in Audiology (ASHA, 2018).
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