Primary objective of this study is the construction and validation of an experimental environment for the simulation of a variety of near- and intermediate-vision activities of daily living (ADLs) in different combinations of light temperature and light intensity.
Among the objectives of the study is to validate a framework of ADLs that require near and intermediate vision and better reflect visual capacity, in a special experimental environment of 9 different combinations of light temperature and light intensity. The final list consists of the following ten basic ADL tasks: 1\. Phone Book Search (PBS), 2. Supermarket receipt (SupRe), 3. Book reading (BR), 4. Cellular message (CM), 5. Cellular entry search (CES), 6. Reading computer screen (RCS), 7. Drops bottle reading (DR), 8. Subtitles reading (SubRe), 9. Open door test (ODT), and, 10. Screwdriver test (ST). The 9 light combinations are the following: 3000 K - 25 fc, 3000 K - 50 fc, 3000 K - 75 fc 4000 K - 25 fc, 4000 K - 50 fc, 4000 K - 75 fc 6000 K - 25 fc, 6000 K - 50 fc, 6000 K - 75 fc
Study Type
OBSERVATIONAL
Enrollment
60
All validation groups address the following ten ADL tasks in 9 different combinations of light temperature (in Kelvins - K) and light intensity (in foot candles - fc) in order possible differences to be revealed among the validation groups and light combinations: 1\. Phone Book Search (PBS), 2. Supermarket receipt (SupRe), 3. Book reading (BR), 4. Cellular message (CM), 5. Cellular entry search (CES), 6. Reading computer screen (RCS), 7. Drops bottle reading (DR), 8. Subtitles reading (SubRe), 9. Open door test (ODT), and, 10. Screwdriver test (ST). The 9 light combinations are the following: 3000 K - 25 fc, 3000 K - 50 fc, 3000 K - 75 fc 4000 K - 25 fc, 4000 K - 50 fc, 4000 K - 75 fc 6000 K - 25 fc, 6000 K - 50 fc, 6000 K - 75 fc
Department of Ophthalmology, University Hospital of Alexandroupolis
Alexandroupoli, Evros, Greece
Phone Book Search (PBS) score
Patient is required to find and read a specific entry in a regular phonebook catalog in the nine different combinations of light temperature and light intensity. A different entry is asked to be found in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Supermarket Receipt (SupRe) score
Patient is required to find and read three products from a typical supermarket receipt in the nine different combinations of light temperature and light intensity. Different products are asked to be found in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Book Reading (BR) score
Patient is required to read an excerpt of a predetermined length in a novel in the nine different combinations of light temperature and light intensity. A different excerpt of the same length is asked to be read in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Cellular message (CM) score
Patient is required to read a Short Message Service (SMS) on a cellular phone in the nine different combinations of light temperature and light intensity. A different SMS is asked to be read in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Cellular Entry Search (CES) score
Patient is required to find and read one specific entry on a cellular phone in the nine different combinations of light temperature and light intensity. Different entries are asked to be found in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
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Reading Computer Screen (RCS) score
Patient is required to correctly read text of a predetermined length from a computer screen in the nine different combinations of light temperature and light intensity. Different texts of the same length are asked to be read in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Drops bottle Reading (DR) score
Patient is required to correctly read the expiration date printed on three typical eye dropper bottles in the nine different combinations of light temperature and light intensity. Different eye dropper bottles are given to be read in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Subtitles Reading (SubRe) score
Patient is required to correctly read movie subtitles from a one-minute movie excerpt on a computer screen in the nine different combinations of light temperature and light intensity. Different movie excerpts are shown in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Open Door Test (ODT) score
Patient is required to find a specific key from a keychain that holds 10 keys and put it in the corresponding door keyhole in the nine different combinations of light temperature and light intensity. Different keychains are given in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Screwdriver Test (ST) score
Patient is required to select one among three screwdrivers and insert it in the appropriate screw among a variety of screw types in the nine different combinations of light temperature and light intensity. Different screwdrivers are given to be selected in each combination. \[scale's best value: 100, scale's worst value: 0\]
Time frame: through study completion, an average of 6 months
Uncorrected Distance Visual Acuity (UDVA)
Monocular and binocular UDVA of all groups is estimated using the Greek version of the Early Treatment Diabetic Retinopathy Study Chart at four meters distance
Time frame: through study completion, an average of 6 months
Uncorrected Intermediate Visual Acuity (UIVA)
Monocular and binocular UIVA of all groups is estimated using web-based Democritus Digital Acuity Reading Test (wDDART)
Time frame: through study completion, an average of 6 months
Uncorrected Near Visual Acuity (UNVA)
Monocular and binocular UNVA of all groups is estimated using web-based Democritus Digital Acuity Reading Test (wDDART)
Time frame: through study completion, an average of 6 months
25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25) score
Vision-specific quality of life of all participants is evaluated with the Greek version of NEI VFQ-25, which is handed to the patients prior to their ADL assessment.
Time frame: through study completion, an average of 6 months