Based on research findings, even minimal, fluctuating or unilateral hearing losses can cause language and cognitive delays, and can be correlated with academic failure (CDC, 2005 in NASDSE, 2018, p. 8).
https://www.doe.virginia.gov/special_ed/disabilities/sensory_disabilities/hearing_impairment/guidelines_working_with_deaf.docx
Any of the above hearing losses can be bilateral , affecting both ears, or unilateral, affecting only one ear. A unilateral hearing loss (UHL) can have conductive, sensorineural or mixed components. The degree of hearing loss in that ear can range from mild to profound. (Visit Boys Town National Research Hospital) A Central Nervous System
https://www.doe.virginia.gov/special_ed/disabilities/sensory_disabilities/hearing_impairment/guidelines_working_with_deaf.docx
have been developed to guide systematic instruction of American Sign Language with students who are deaf and hard of hearing, especially students for whom ASL is their primary language. (Refer to Appendix I , Instructional Resources and
https://www.doe.virginia.gov/special_ed/disabilities/sensory_disabilities/hearing_impairment/guidelines_working_with_deaf.docx
AB word lists are suitable for older children and adults. They can both be used with lipreading (but be aware that some sounds are easier to lipread and the lists have not taken this into account). Neither of the lists is suitable for children with a profound hearing loss unless used with lipreading.
https://bso.bradford.gov.uk/userfiles/file/STDC/assessments%20%20booklet.doc
doc for "hearing loss not understanding words".(Page 1 of about 16 results)