It depends; there are many causes of reading difficulties with vision problems being one of them.
Vision is a key component involved in reading. In addition to eye tracking, teaming and focusing skills, higher visual processing skills are needed. For visual processing of the text, word recognition, recall, and comprehension, your child needs developed skills in visual discrimination, attention, memory, and visualization. These skills should be automatic, but for individuals with visual deficiencies excess energy is exerted on the visual mechanics of reading and comprehension suffers.
To determine if your child’s reading struggles are related to vision, a thorough vision evaluation is recommended.