Disclosing Disabilities
Deciding when to disclose your disability is your own personal decision. It can be made at any point during the job search process and even after you have begun working.
You can wait until you know what you need on the job before you disclose. In fact it helps if you have thought about some possible solutions to include in that first discussion. This isn't an issue of whether you are being honest or not, it's making sure you first understand the nature of the job so that you can identify and suggest appropriate accommodations. This shows the employer that you want to make sure you are a productive member of the team. Not disclosing at all is also an option, if you do not require any accommodations to perform the essential functions of the job.
After you identify the need for specific accommodations, the negotiation of accommodations is meant to be an on-going, interactive process.