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Graham wrote this definition of significant combined sight and hearing loss:

A person will be regarded as having a "significant" combined sight and hearing loss when the combination of their two impairments results in greater or more complex difficulties with communication, access to information and mobility than would be experienced by a partially-sighted or hard-of-hearing person.The guiding principle here is that anyone will be regarded as having "a significant sight and hearing loss" when the combination of the two impairments prevents one compensating fully for the other.examples:

1. A hard-of-hearing person who has difficulty lipreading due to sight problems.

2. A partially-sighted person when they have difficulty hearing the spoken word against background noise and are unable to lipread at a similar distance to a sighted deaf person.

3. A partially-sighted or hard-of-hearing person, when travelling, who has difficulty following both voice announcements and visual displays.