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Frequently Asked Questions


NDA Help Center

Filter Cart

The Filter Cart provides a powerful way to query and access data for which you may be interested.  

A few points related to the filter cart are important to understand with the NDA Query/Filter implementation: 

First, the filter cart is populated asyncronously.  So, when you run a query, it may take a moment to populate but this will happen in the background so you can define other queries during this time.  

When you are adding your first filter, all data associated with your query will be added to the filter cart (whether it be a collection, a concept, a study, a data structure/elment or subjects). Not all data structures or collections will necessarily be displayed.  For example, if you select the NDA imaging structure image03, and further restrict that query to scan_type fMRI, only fMRI images will appear and only the image03 structure will be shown.  To see other data structures, select "Find All Subject Data" which will query all data for those subjects. When a secord or third filter is applied, an AND condition is used.  A subject must exist in all filters.  If the subject does not appear in any one filter, that subjects data will not be included in your filter cart. If that happens, clear your filter cart, and start over.  

It is best to package more data than you need and access those data using other tools, independent of the NDA (e.g. miNDAR snapshot), to limit the data selected.  If you have any questions on data access, are interested in using avaialble web services, or need help accessing data, please contact us for assistance.  

Frequently Asked Questions



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NDA provides a single access to de-identified autism research data. For permission to download data, you will need an NDA account with approved access to NDA or a connected repository (AGRE, IAN, or the ATP). For NDA access, you need to be a research investigator sponsored by an NIH recognized institution with federal wide assurance. See Request Access for more information.

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Eye Examination



Download Definition as
Download Submission Template as
Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired field
interview_ageIntegerRequiredAge in months at the time of the interview/test/sampling/imaging.0 :: 1260Age is rounded to chronological month. If the research participant is 15-days-old at time of interview, the appropriate value would be 0 months. If the participant is 16-days-old, the value would be 1 month.
sexString20RequiredSex of the subjectM;FM = Male; F = Femalegender
siteString101RecommendedSiteStudy Site
visitString50RecommendedVisit name
prev_ex1String10RecommendedOphthalmologist ID
prev_ex2IntegerRecommendedDid the participant cooperate during the exam1;22=No; 1=Yes
prev_ex3String50RecommendedNot cooperated, reason
prev_ex4IntegerRecommendedWas the external exam normal1;22=No; 1=Yes
prev_ex5String50RecommendedExam not normal, specify
prev_ex6IntegerRecommendedAre the pupils normal1;22=No; 1=Yes
prev_ex7IntegerRecommendedPupils abnormal1::31=irregular shape; 2= afferent defect; 3=other
prev_ex8String50RecommendedPupils abnorm other, specify
prev_ex9IntegerRecommendedWas the retinoscopy performed1;22=No; 1=Yes
prev_ex10IntegerRecommendedRetinoscopy result1;21=Normal; 2= abnormal
prev_ex11IntegerRecommendedMyopia1;21=Present; 2= absent
prev_ex12IntegerRecommendedHyperopia1;21=Present; 2= absent
prev_ex13IntegerRecommendedAnisometropia1;21=Present; 2= absent
prev_ex14IntegerRecommendedWere corrective lenses recommended1;22=No; 1=Yes
prev_ex15IntegerRecommendedWas strabismus present1;22=No; 1=Yes
prev_ex16IntegerRecommendedStrabismus present, specify 11::31=Esotropia; 2=Exotropia; 3=None
prev_ex17IntegerRecommendedStrabismus present, specify 21::31=Hypertropia; 2=Hypotropia; 3=None
prev_ex18IntegerRecommendedWas visual acuity performed1;22=No; 1=Yes
prev_ex19IntegerRecommendedVisual acuity results1;21=Normal; 2= abnormal
prev_ex20String5RecommendedVisual acuity abnormal, specify1=Failure to fix and follow; 2=Failure to maintain central fixation
prev_ex21IntegerRecommendedWas the Bruckner test performed1;22=No; 1=Yes
prev_ex22IntegerRecommendedBruckner test results1;21=Normal; 2= abnormal
prev_ex23String10RecommendedBruckner test results abnormal, specify1=absent; 2= white; 3=dull, opacified; 4= asymmetric; 5=other
prev_ex24String50RecommendedBruckner test results abnormal other, specify
prev_ex25IntegerRecommendedWere corneal reflexes normal1;22=No; 1=Yes
prev_ex26String5RecommendedCorneal reflexes abnormal1=Asymetric; 2=Displaced
prev_ex27IntegerRecommendedWas a dilated funduscopic examination performed1;22=No; 1=Yes
prev_ex28IntegerRecommendedDilated funduscopic examination results1;21=Normal; 2= abnormal
prev_ex29String5RecommendedDilated funduscopic examination results abnormal, specify1=Retinal hamartomas; 2= optic atrophy
prev_ex30IntegerRecommendedWere photos taken1;22=No; 1=Yes
prev_ex31IntegerRecommendedIs there a high index of suspicion for decreased visual function1;22=No; 1=Yes
prev_ex32IntegerRecommendedWas OCT ordered1;22=No; 1=Yes
prev_ex33IntegerRecommendedDoes the parent report normal vision at home1;22=No; 1=Yes
commentsString4,000RecommendedComments about assessment
prev_ex35IntegerRecommendedHas there been a significant change in the eye exam since the last visit1;22=No; 1=Yes
prev_ex36IntegerRecommendedDoes the change warrant notigfication of site PI1;22=No; 1=Yes
Data Structure

This page displays the data structure defined for the measure identified in the title and structure short name. The table below displays a list of data elements in this structure (also called variables) and the following information:

  • Element Name: This is the standard element name
  • Data Type: Which type of data this element is, e.g. String, Float, File location.
  • Size: If applicable, the character limit of this element
  • Required: This column displays whether the element is Required for valid submissions, Recommended for valid submissions, Conditional on other elements, or Optional
  • Description: A basic description
  • Value Range: Which values can appear validly in this element (case sensitive for strings)
  • Notes: Expanded description or notes on coding of values
  • Aliases: A list of currently supported Aliases (alternate element names)
  • For valid elements with shared data, on the far left is a Filter button you can use to view a summary of shared data for that element and apply a query filter to your Cart based on selected value ranges

At the top of this page you can also:

  • Use the search bar to filter the elements displayed. This will not filter on the Size of Required columns
  • Download a copy of this definition in CSV format
  • Download a blank CSV submission template prepopulated with the correct structure header rows ready to fill with subject records and upload

Please email the The NDA Help Desk with any questions.

Distribution for DataStructure: prevex01 and Element:
Chart Help

Filters enable researchers to view the data shared in NDA before applying for access or for selecting specific data for download or NDA Study assignment. For those with access to NDA shared data, you may select specific values to be included by selecting an individual bar chart item or by selecting a range of values (e.g. interview_age) using the "Add Range" button. Note that not all elements have appropriately distinct values like comments and subjectkey and are not available for filtering. Additionally, item level detail is not always provided by the research community as indicated by the number of null values given.

Filters for multiple data elements within a structure are supported. Selections across multiple data structures will be supported in a future version of NDA.