R W Massof

Summary

Affiliation: Johns Hopkins University
Country: USA

Publications

  1. ncbi request reprint The Activity Inventory: an adaptive visual function questionnaire
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
    Optom Vis Sci 84:763-74. 2007
  2. ncbi request reprint Is the partial credit model a Rasch model?
    Robert W Massof
    Johns Hopkins University School of Medicine, USA
    J Appl Meas 13:114-31. 2012
  3. doi request reprint Latent dry eye disease state variable
    Robert W Massof
    Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    Invest Ophthalmol Vis Sci 53:1905-16. 2012
  4. ncbi request reprint Visual disability variables. II: The difficulty of tasks for a sample of low-vision patients
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Arch Phys Med Rehabil 86:954-67. 2005
  5. ncbi request reprint Visual disability variables. I: the importance and difficulty of activity goals for a sample of low-vision patients
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Arch Phys Med Rehabil 86:946-53. 2005
  6. ncbi request reprint Likert and Guttman scaling of visual function rating scale questionnaires
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, 6th Floor, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, 550 N Broadway, Baltimore, MD 21205, USA
    Ophthalmic Epidemiol 11:381-99. 2004
  7. ncbi request reprint What do different visual function questionnaires measure?
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Ophthalmic Epidemiol 14:198-204. 2007
  8. ncbi request reprint Self-reported importance and difficulty of driving in a low-vision clinic population
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
    Invest Ophthalmol Vis Sci 48:4955-62. 2007
  9. ncbi request reprint A clinically meaningful theory of outcome measures in rehabilitation medicine
    Robert W Massof
    Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
    J Appl Meas 11:253-70. 2010
  10. ncbi request reprint An interval-scaled scoring algorithm for visual function questionnaires
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Optom Vis Sci 84:689-704. 2007

Research Grants

  1. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 1999
  2. DISTANCE LEARNING SYSTEM FOR LOW VISION REHABILITATION
    Robert Massof; Fiscal Year: 2007
  3. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2007
  4. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2006
  5. Low Vision Rehabilitation Consensus Project
    Robert Massof; Fiscal Year: 2006
  6. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2005
  7. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2004
  8. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2003
  9. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2002
  10. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2001

Detail Information

Publications35

  1. ncbi request reprint The Activity Inventory: an adaptive visual function questionnaire
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
    Optom Vis Sci 84:763-74. 2007
    ..The purpose of the present article is to test the hypothesis that all combinations of items in the AI, and by extension all visual function questionnaires, measure the same visual ability variable...
  2. ncbi request reprint Is the partial credit model a Rasch model?
    Robert W Massof
    Johns Hopkins University School of Medicine, USA
    J Appl Meas 13:114-31. 2012
    ..Using the metaphor and a literal interpretation of the narrative description of the PCM by Masters (1982), a new version of the PCM is derived that does conform to the rules of measurement...
  3. doi request reprint Latent dry eye disease state variable
    Robert W Massof
    Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    Invest Ophthalmol Vis Sci 53:1905-16. 2012
    ..A theory for estimating Θ from scaled clinical observations is developed, and the hypothesis is tested that Θ exists...
  4. ncbi request reprint Visual disability variables. II: The difficulty of tasks for a sample of low-vision patients
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Arch Phys Med Rehabil 86:954-67. 2005
    ..To test the validity and reliability of measures of visual ability and to evaluate the relation between measurements made at the task level and measurements made at the goal level of a hierarchical model for visual disability...
  5. ncbi request reprint Visual disability variables. I: the importance and difficulty of activity goals for a sample of low-vision patients
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Arch Phys Med Rehabil 86:946-53. 2005
    ..To test the validity and reliability of latent trait measures estimated from ratings by low-vision patients of the importance and difficulty of selected activity goals...
  6. ncbi request reprint Likert and Guttman scaling of visual function rating scale questionnaires
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, 6th Floor, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, 550 N Broadway, Baltimore, MD 21205, USA
    Ophthalmic Epidemiol 11:381-99. 2004
    ..To test the assumptions underlying Likert scoring of visual function questionnaires...
  7. ncbi request reprint What do different visual function questionnaires measure?
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Ophthalmic Epidemiol 14:198-204. 2007
    ..Despite differences, all VFQs are designed to measure vision-related functional ability in visually impaired people. The objective is to determine whether four popular VFQs measure the same variable in visually impaired patients...
  8. ncbi request reprint Self-reported importance and difficulty of driving in a low-vision clinic population
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
    Invest Ophthalmol Vis Sci 48:4955-62. 2007
    ..To validate estimates of self-perceived driving ability from difficulty ratings of driving tasks and to determine the association of the importance and difficulty of driving with the magnitude of visual impairments...
  9. ncbi request reprint A clinically meaningful theory of outcome measures in rehabilitation medicine
    Robert W Massof
    Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
    J Appl Meas 11:253-70. 2010
    ..e., the probability of obtaining criterion outcome measures given the observed state of the patient and the choice of interventions...
  10. ncbi request reprint An interval-scaled scoring algorithm for visual function questionnaires
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Optom Vis Sci 84:689-704. 2007
    ..A secondary purpose is to test the hypothesis that all VFQs measure the same visual ability variable and can be calibrated to a common measurement scale...
  11. doi request reprint Understanding Rasch and item response theory models: applications to the estimation and validation of interval latent trait measures from responses to rating scale questionnaires
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Eye Institute, Johns Hopkins University School of Medicine, MD, USA
    Ophthalmic Epidemiol 18:1-19. 2011
    ....
  12. ncbi request reprint The measurement of vision disability
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
    Optom Vis Sci 79:516-52. 2002
    ..We conclude that preliminary data relating measures of vision disability to measures of visual acuity and visual fields support the new AMA vision disability scale...
  13. ncbi request reprint A model of the prevalence and incidence of low vision and blindness among adults in the U.S
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Optom Vis Sci 79:31-8. 2002
    ..Based on the incidence rate estimates, approximately 240,000 new cases of low vision and blindness occur each year. With the aging of the U.S. population, that number is expected to double over the next 25 years...
  14. ncbi request reprint Evaluation of the NEI visual functioning questionnaire as an interval measure of visual ability in low vision
    R W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, 6th Floor, 550 North Broadway, Baltimore, MD 21205, USA
    Vision Res 41:397-413. 2001
    ..g. psychological state). The visual ability scale estimated from the 17 NEI-VFQ items is proportional to the visual ability scales estimated from two earlier studies that also elicited difficulty ratings from low-vision patients...
  15. ncbi request reprint Nonlinear contribution of eye velocity to motion perception
    K A Turano
    Johns Hopkins University School of Medicine, Wilmer Eye Institute, Baltimore, MD, USA
    Vision Res 41:385-95. 2001
    ..A comparison of the goodness of fits between models demonstrated that the success of the model is the interaction term, i.e. the modification of the compensating eye velocity signal by the retinal velocity prior to combination...
  16. ncbi request reprint Grating visual acuity using the preferential-looking method in elderly nursing home residents
    David S Friedman
    Dana Center for Preventive Ophthalmology, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland 21287, USA
    Invest Ophthalmol Vis Sci 43:2572-8. 2002
    ..To assess the performance of two approaches to visual acuity testing in a group of nursing home residents with cognitive impairment. The study was a cross-sectional comparison of the effectiveness of two tests of visual acuity...
  17. ncbi request reprint A self-assessment instrument designed for measuring independent mobility in RP patients: generalizability to glaucoma patients
    Kathleen A Turano
    Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Invest Ophthalmol Vis Sci 43:2874-81. 2002
    ....
  18. ncbi request reprint A systems model for low vision rehabilitation. II. Measurement of vision disabilities
    R W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Optom Vis Sci 75:349-73. 1998
    ..The need for rehabilitation to meet each goal is represented by "rehabilitative demand," a mathematical function of the measurements made of the value and difficulty of achieving each goal independently...
  19. ncbi request reprint Visual function assessment questionnaires
    R W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Surv Ophthalmol 45:531-48. 2001
    ..It is concluded that future research and development should devote additional attention to the measurement properties of functional assessment instruments...
  20. doi request reprint Validation of a visual function and quality of life instrument in an urban Indian population with uncorrected refractive error using Rasch analysis
    Christopher J Brady
    Dana Center for Preventive Ophthalmology, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA
    Ophthalmic Epidemiol 17:282-91. 2010
    ..To develop and validate a patient-reported outcome measure of refractive error for persons living in developing countries...
  21. ncbi request reprint Application of stochastic measurement models to visual function rating scale questionnaires
    Robert W Massof
    Lions Vision Research and Rehabilitation Center, Wilmer Ophthalmological Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
    Ophthalmic Epidemiol 12:103-24. 2005
    ....
  22. ncbi request reprint Measuring the severity of stress urinary incontinence using the Incontinence Impact Questionnaire
    Victoria L Handa
    Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Neurourol Urodyn 23:27-32. 2004
    ..The purpose of this study is to test the hypothesis that incontinence-related disability is a measurable variable and that the IIQ can measure that variable accurately...
  23. doi request reprint Economic evaluation of blind rehabilitation for veterans with macular diseases in the Department of Veterans Affairs
    Kevin T Stroupe
    Veterans Affairs Cooperative Studies Program Coordinating Center, Edward Hines Jr Veterans Affairs Hospital, Hines, Illinois 60141, USA
    Ophthalmic Epidemiol 15:84-91. 2008
    ..We examined costs and consequences using veterans in LOVIT and comparable veterans in an inpatient BRC...
  24. doi request reprint Moving toward scientific measurements of quality of life
    Robert W Massof
    Ophthalmic Epidemiol 15:209-11. 2008
  25. ncbi request reprint Psychometric properties of the Veterans Affairs Low-Vision Visual Functioning Questionnaire
    Joan A Stelmack
    Blind Rehabilitation Center, Edward Hines VA Hospital, Hines, Illinois 60141, USA
    Invest Ophthalmol Vis Sci 45:3919-28. 2004
    ....
  26. ncbi request reprint Measuring outcomes of vision rehabilitation with the Veterans Affairs Low Vision Visual Functioning Questionnaire
    Joan A Stelmack
    Blind Rehabilitation Center, Edward Hines VA Hospital, Hines, IL 60141, USA
    Invest Ophthalmol Vis Sci 47:3253-61. 2006
    ....
  27. ncbi request reprint Using the VA LV VFQ-48 and LV VFQ-20 in low vision rehabilitation
    Joan A Stelmack
    Blind Rehabilitation Center, Edward Hines Veterans Affairs Hospital, Hines, Illinois 60141, USA
    Optom Vis Sci 84:705-9. 2007
    ....
  28. ncbi request reprint Measuring low-vision rehabilitation outcomes with the NEI VFQ-25
    Joan A Stelmack
    Blind Rehabilitation Center, Edward Hines VA Hospital, Hines, Illinois 60141, USA
    Invest Ophthalmol Vis Sci 43:2859-68. 2002
    ..To evaluate the sensitivity of the National Eye Institute Visual Functioning Questionnaire-25 (NEI VFQ-25) to change in visual abilities after low-vision rehabilitation in two different Veterans Administration (VA) low-vision programs..
  29. doi request reprint Outcomes of the Veterans Affairs Low Vision Intervention Trial (LOVIT)
    Joan A Stelmack
    Blind Rehabilitation Center, Edward E Hines Jr Veterans Affairs Hospital, Hines, Illinois 60141, USA
    Arch Ophthalmol 126:608-17. 2008
    ..To evaluate the effectiveness of a low-vision rehabilitation program...
  30. ncbi request reprint The Veterans Affairs Low Vision Intervention Trial (LOVIT): design and methodology
    Joan A Stelmack
    Blind Rehabilitation Center, Edward E Hines Jr Veterans Affairs Hospital, Hines, IL 60141, USA
    Clin Trials 4:650-60. 2007
    ..Vision rehabilitation programs have the potential to restore independence and improve quality of life for persons with permanent vision loss, and few have been evaluated in randomized controlled trials...
  31. ncbi request reprint Use of Rasch person-item map in exploratory data analysis: a clinical perspective
    Joan Stelmack
    Blind Rehabilitation Center 124, Edward Hines VA Hospital, Hines, IL 60141, USA
    J Rehabil Res Dev 41:233-41. 2004
    ..The Rasch person-item map demonstrates that the field-test version of the VA LV VFQ-48 has good range and is well centered with respect to the person measure distribution. Construct validity and reliability are also demonstrated...
  32. ncbi request reprint Is there a standard of care for eccentric viewing training?
    Joan A Stelmack
    Blind Rehabilitation Center 124, Edward Hines VA Hospital, Hines, IL 60141, USA
    J Rehabil Res Dev 41:729-38. 2004
    ..The results of this survey reveal an inconsistent standard of practice across VA centers and demonstrate the need for prospective studies of the efficacy, effectiveness, and cost-effectiveness of EV training...
  33. ncbi request reprint Natural course of visual field loss in patients with Type 2 Usher syndrome
    Gerald A Fishman
    Department of Ophthalmology and Visual Sciences, UIC Eye Center, University of Illinois at Chicago, 1855 W Taylor Street, Chicago, IL 60612, USA
    Retina 27:601-8. 2007
    ..To evaluate the natural course of visual field loss in patients with Type 2 Usher syndrome and different patterns of visual field loss...
  34. ncbi request reprint Short- and long-term effects of an intensive inpatient vision rehabilitation program
    Joan A Stelmack
    Blind Rehabilitation Center, Edward E Hines VA Hospital, Hines, IL 60141, USA
    Arch Phys Med Rehabil 88:691-5. 2007
    ..To assess the effects of a visual rehabilitation program on visually impaired subjects' visual ability and ability to perform activities...
  35. ncbi request reprint Timing and directions for administration of questionnaires affect outcomes measurement
    Joan A Stelmack
    Blind Rehabilitation Center, Edward Hines Jr Department of Veterans Affairs VA Hospital, Hines, IL 60141, USA
    J Rehabil Res Dev 43:809-16. 2006
    ..For these subjects, the improvement noted in the person measure disappeared at follow-up, while the improvement in the item measure was maintained...

Research Grants12

  1. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 1999
    ..Determining if the NEI-VFQ, VF-14, ADVS, VAQ, SF-36, and SIP can be calibrated to common scales will test the hypothesis that there is a common functional ability variable(s). ..
  2. DISTANCE LEARNING SYSTEM FOR LOW VISION REHABILITATION
    Robert Massof; Fiscal Year: 2007
    ..All testing will be done with volunteers recruited from among students taking the online low vision course developed in Phase 1. ..
  3. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2007
    ..And, to achieve Aim 4, we will use triadic comparison and willingness-to-pay methods of measuring the values of alternative low vision rehabilitation outcomes. ..
  4. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2006
    ..And, to achieve Aim 4, we will use triadic comparison and willingness-to-pay methods of measuring the values of alternative low vision rehabilitation outcomes. ..
  5. Low Vision Rehabilitation Consensus Project
    Robert Massof; Fiscal Year: 2006
    ..abstract_text> ..
  6. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2005
    ..And, to achieve Aim 4, we will use triadic comparison and willingness-to-pay methods of measuring the values of alternative low vision rehabilitation outcomes. ..
  7. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2004
    ..And, to achieve Aim 4, we will use triadic comparison and willingness-to-pay methods of measuring the values of alternative low vision rehabilitation outcomes. ..
  8. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2003
    ..And, to achieve Aim 4, we will use triadic comparison and willingness-to-pay methods of measuring the values of alternative low vision rehabilitation outcomes. ..
  9. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2002
    ..Determining if the NEI-VFQ, VF-14, ADVS, VAQ, SF-36, and SIP can be calibrated to common scales will test the hypothesis that there is a common functional ability variable(s). ..
  10. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2001
    ..Determining if the NEI-VFQ, VF-14, ADVS, VAQ, SF-36, and SIP can be calibrated to common scales will test the hypothesis that there is a common functional ability variable(s). ..
  11. VISION DISABILITIES IN LOW VISION
    Robert Massof; Fiscal Year: 2000
    ..Determining if the NEI-VFQ, VF-14, ADVS, VAQ, SF-36, and SIP can be calibrated to common scales will test the hypothesis that there is a common functional ability variable(s). ..