Sometimes it is to your advantage to discuss your disability openly in a cover letter. For example, some employers specifically recruit the disabled to meet affirmative action goals or because they have a state or federal contract that requires hiring disabled. Once again, as in the resume, do not start the cover letter with details about your disability. Then continue describing how you will perform the essential functions of the job. On the Application Form Standard employment applications may be required.
Some organizations require all job hunters to complete a standardized form.
Most of the forms have a section for disability disclosure but this is not mandatory. You do not have to disclose your disability. You have the option but are not required by law to discuss any aspect of your limitation. The major drawback of disclosing at this point in the process is that you may not have room on the form to describe accommodations or how you overcome your limitations. This could be a disadvantage.