OBJECTIVE: To detect early losses of contrast sensitivity (CS) in patients with pituitary adenomas, before the occurrence of visual acuity and visual field defects. METHODS: CS has been evaluated in both hemifields of 28 patients with different kinds of pituitary adenoma (mainly intrasellar) and normal visual acuity and visual field, as well as in 15 age-matched controls. Two different stimuli were used: a coarse (0.3 c/deg) dynamic (10 Hz) grating and a finer (2 c/deg) static grating. RESULTS: On average, CS and/or hemifield asymmetry were reduced in patients, whereas perimetric sensitivity was normal. CS losses were more frequent for 2 c/deg static-, as compared with 0.3 c/deg, 10 Hz stimuli. However selective losses for either stimuli were also found. CS losses did not correlate with anatomical measurements (size, chiasm involvement) of tumors as established by MRI scans. CONCLUSIONS: CS evaluation may provide a simple and effective tool for early detection and monitoring of visual dysfunction in patients with pituitary adenoma. The lack of correlation between CS losses and chiasm involvement suggests causes different from chiasmal compression for visual dysfunction.
OBJECTIVE: To detect early losses of contrast sensitivity (CS) in patients with pituitary adenomas, before the occurrence of visual acuity and visual field defects. METHODS: CS has been evaluated in both hemifields of 28 patients with different kinds of pituitary adenoma (mainly intrasellar) and normal visual acuity and visual field, as well as in 15 age-matched controls. Two different stimuli were used: a coarse (0.3 c/deg) dynamic (10 Hz) grating and a finer (2 c/deg) static grating. RESULTS: On average, CS and/or hemifield asymmetry were reduced in patients, whereas perimetric sensitivity was normal. CS losses were more frequent for 2 c/deg static-, as compared with 0.3 c/deg, 10 Hz stimuli. However selective losses for either stimuli were also found. CS losses did not correlate with anatomical measurements (size, chiasm involvement) of tumors as established by MRI scans. CONCLUSIONS: CS evaluation may provide a simple and effective tool for early detection and monitoring of visual dysfunction in patients with pituitary adenoma. The lack of correlation between CS losses and chiasm involvement suggests causes different from chiasmal compression for visual dysfunction.
Authors: David A Paul; Elon Gaffin-Cahn; Eric B Hintz; Giscard J Adeclat; Tong Zhu; Zoë R Williams; G Edward Vates; Bradford Z Mahon Journal: Sci Transl Med Date: 2014-12-10 Impact factor: 17.956
Authors: David A Paul; Alejandra Rodrigue; Nicholas Contento; Sam Haber; Ricky Hoang; Redi Rahmani; Adnan Hirad; Ismat Shafiq; Zoë Williams; G Edward Vates Journal: PLoS One Date: 2022-08-03 Impact factor: 3.752
Authors: David A Paul; Emma Strawderman; Alejandra Rodriguez; Ricky Hoang; Colleen L Schneider; Sam Haber; Benjamin L Chernoff; Ismat Shafiq; Zoë R Williams; G Edward Vates; Bradford Z Mahon Journal: Front Med (Lausanne) Date: 2021-07-08