In addition, the diffractive multifocal IOL has a full anterior aspheric design that corrects for 0.27 μm while the refractive multifocal IOL has asphericity of –0.37 μm under photopic conditions. Both of the IOLs are made of the same low-chromatic-aberration acrylic material. However, the di...
Absolute acuity refers to the lowest point at which a stimulus can be recognized. For instance, when taking a hearing test the patient is subjected to tones of many frequencies and volume levels. The tones are presented to the patient starting with the vary faint and gradually becoming louder....
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Hearing aids should be fitted to targets for gain and output based on a prescriptive method that is evidence-based and specifically developed for use with children.44 Targets should be based on ensuring audibility for speech across a wide range of input levels, including audibility for the child...
When the signals were presented at equal sensation levels, the impaired subjects exhibited significantly poorer discrimination than the normally hearing subjects, indicating a reduced ability to resolve the step modulation. Implications for formant processing by the hearing impaired will be discussed. [...
hearing. At each sound-wave frequency, the subject’s hearing loss in decibels can be determined from the audiometer dial. This dial has been calibrated with a standard of “normal hearing” for the population. These normal hearing levels have been determined through testing a large, ...
A comparison of the hearing losses of enginemen to those of all others as a function of time on boat, for each frequency, showed that in general the enginemen had greater losses at all frequencies although there were minor reversals. The amount of loss was slightly less than expected from...
investigations to identify: (a) appropriate visual screening approaches with preschool through secondary level hearing-impaired students and (b) acceptable, less expensive alternatives to the Orthorater for near visual acuity screening of hearing-impaired students (preschool through postsecondary levels). ...
1 People in the US fear losing vision more than memory, hearing, or speech, and consider visual acuity loss among the top 4 worst things that could happen to them.2 No existing estimates appear to have used empirical data to estimate geographic differences, created estimates for persons ...
Hearing Acuity of Children With Otitis Media With Effusion Hearing levels are reported for a cohort of 222 infants (aged 7 to 24 months) and 540 older children (aged 2 to 12 years) with otitis media with effusion (... TJ Fria,EI Cantekin,JA Eichler - 《Archives of Otolaryngology-head ...