Background and Objectives: Advanced phonological skills are important for the acquisition of reading skills. Children with hearing impairment have reading skills are weaker than others because of auditory inputs and due to the defect in phonological skills. The use of hearing aids and cochlear implants help to collect information on people who are hard of hearing.
Methods: This descriptive - analytic study was done on 12 children with cochlear implant and 12 children with hearing aids that were selected from second grades students of Tehran primary schools. Children's phonological performance was assessed by phonological subtests of Nama reading test and the data were analyzed using version 16.0 of SPSS.
Results: The results showed that the means of scores of children with cochlear implants in Rhyme task were significantly greater than the children with hearing aids (P=0.034). But in means of scores of Phone deletion and Non-word reading tasks were not significant different between two groups (P=0.919, P=0.670).
Conclusion: Cochlear implant with accessibility auditory inputs can facilitated the acquisition of phonological awareness skills in hearing loss children. But whereas the other language inputs such as sight and touch input helped to developing these skills, children with hearing aids too also can acquisition these skills.

Background and Objective: Word definition is a linguistic and metalinguistic skill related to the development of language, academic success and intellectual function. There is a little research in the field of word definition in children with cochlear implant (CI) in Iran. Therefore, the purpose of this study was to examine and compare the word definition in children with CI with normal children.
Materials and Methods: In this cross-sectional study, 22 children with CI and 22 normal children aged 6 to 8 years were selected in an available manner to assess the word definition by using the test conducted by Mohammadi and et.al (2009). The inclusion criteria included being monolingual, congenital impairment, using of the CI device, operating up to three years of age, the presence of any comorbidity and getting the early intervention. Exclusion criteria included the lack of cooperation of the examinee. It was used SPSS v.19 for statistical analysis. Mean, standard deviation, minimum and maximum scores were calculated. Also, it was used, the Mann-Whitney test to determine the significant differences of the scores of variables.
Results: The normal group gained the highest scores in the three section, functional (p = 0.003) and structural (p <0.001) aspects, and have a higher score in the total word definition test (p <0.001).
Conclusion: The weakness of hearing in impaired children in vocabulary definition skill demonstrate their semantic and syntactical deficits. There were aligned studies with our results in specific language impairment which are expected to be considered by speech and language pathologists (SLPs) in their interventional planning.