Inclusion Criteria:

For Participant Selection:

1. * Participant has any clinically documented sign(s) and/or symptom(s) consistent with an Inherited Retinal Disease (IRD), or asymptomatic with documented retinal changes detected by imaging or electrophysiology
2. * Participant has documented genetic variant(s) (known pathogenic, likely pathogenic, or variants of uncertain significance) in relevant genes for any of the following IRDs: X-Linked Retinitis Pigmentosa (XLRP) and/or Achromatopsia (ACHM)
3. * Participant or legally acceptable representative has provided informed consent (and participant assent, when applicable) in accordance with local requirements
4. * Participant is able to have relevant visual and/or retinal assessments performed

For Caregiver Selection:

1. * Caregiver has consent from the associated participant to participate in the study, or participant assent and consent from their legally acceptable representative
2. * Male or female aged greater than or equal to (\>=)18 years
3. * Identified by an enrolled participant (or their legally acceptable representative\*) as a primary caregiver
4. * Caregiver has provided informed consent in accordance with local requirements

Exclusion Criteria:

For Participant Selection:

- Participant has received a treatment in an IRD-related interventional trial, or is being screened for an IRD-related interventional trial

For Caregiver Selection:

- Caregiver has an IRD diagnosis and presents with symptoms (visual impairment)