Jack E. Terry

Non-contact and Mackay-Marg tonometry: comparison in patients ages 7 to 85 years.

&NA; In a sample of 212 eyes of patients referred to an ocular pathology clinic, measures of intraocular pressure (IOP) using the noncontact tonometer (NCT) and the Mackay‐Marg tonometer were highly correlated (+0.91), the NCT measures being lower by an average of 6.5 mm Hg. In a general optometry clinic, the mean IOP as measured with the NCT on 987 eyes of patients, ages 7 to 85 years, was 15.7 mm Hg (S.D. = 3.5 mm Hg). Stability of IOP was age, found for this sample, is unexpected if IOP is proportional to systemic blood pressure which rises with age. Several hypotheses propose to explain the apparent inconsistency.

Ophthalmic solutions: viscosity builders.

ABSTRACT The relative viscosities of five agents commonly used in ophthalmic solutions as “viscosity builders” were measured as a function of their concentration.

Hemangioma of the apical orbit diagnosed by radionuclide imaging

Hemangiomas are benign vascular hamartomas which occur more commonly in women between the ages of 30 and 50 years. These tumors are among the most common lesions found in the adult orbit. The purpose of this report is to describe the usefulness of delayed blood pool scans for diagnosing unusually located hemangiomas as highlighted in our report of a 67-year-old white male who reported initially with unilateral proptosis. Computed tomography and magnetic resonance imaging showed a distinct mass measuring 1.6 cm anteroposterior diameter by 1.5 cm width by 1.2 cm height near the apex of the orbit. A gallium scan was negative for a solid tumor. A technetium-99 m blood pool (hemangioma SPECT scan) was positive, consistent with a hemangioma of the orbital soft tissue.

Optic nerve head stereoscopic digital imaging using bichromatic techniques

The variability of optic nerve parameters obtained with versions 3.4 and 3.5 of the Topcon IMAGEnet computer stereo analysis system was studied. The consistency of horizontal cup-to-disc ratio, vertical cup-to-disc ratio, cup volume, neuroretinal rim area, neuroretinal rim-to-disc area, and the percentage of poorly correlated conjugate points (bad points) on the stereo pair was compared. The updated computer program for stereo analysis provides a significantly more accurate means to assess both the cup volume and the neuroretinal rim area as evidenced by the smaller number of bad points.

The Corneal Environment: Osmotic Responses

Perfect isotonicity (i.e., corresponding to a 0.90% NaCl solution) is now known to rank amongst the rarest of open eye tear conditions (1). Based on a series of 420 samples from six young, healthy subjects, an average value of 0.97% (310 m0s/Kg) was found for the waking hours. The most common range of scatter observed was from about 0.93 to just over 1.00% in the course of a day. In contrast, the average value associated with periods of prolonged lid closure was 0.89% (285 m0s/Kg), or just mildly hypotonic.