Egyptian Board Ophthalmology - independent subject foundations key terms
Egyptian Board Ophthalmology - independent subject foundations · Get comfortable with the vocabulary.
- Vergence
A signed optical quantity relating wavefront curvature to refractive index and distance under the specified model and convention.
- Vertex distance
The distance between a spectacle lens reference plane and the cornea, relevant when converting higher-powered corrections between planes.
- Prism diopter
A unit of prismatic deviation interpreted with the actual base direction, distinct from a spherical lens power in diopters.
- Principal meridian
A meridian of an astigmatic optical system corresponding to one of its principal refractive powers under the stated axis convention.
- Deturgescence
The relative dehydration state supporting corneal transparency through balanced barrier and transport processes rather than an absence of all stromal water.
- Keratic precipitate
A cellular deposit on the corneal endothelium whose pattern can contribute to the assessment of intraocular inflammation.
- Biometry
Measurement of ocular dimensions and related parameters used in planning an implant calculation with the appropriate formula and assumptions.
- Post-occlusion surge
An abrupt fluidic change after aspiration-port occlusion breaks, potentially reducing chamber stability under the relevant equipment conditions.
- Posterior capsule opacification
A postoperative capsule change involving residual lens-cell activity rather than reappearance of the removed natural crystalline lens cataract.
- Rhegmatogenous detachment
Separation of neurosensory retina associated with a full-thickness break allowing fluid into the subretinal space under the relevant traction conditions.
- Retinal neovascularization
Growth of abnormal new retinal or disc vessels associated with ischemic and other processes, distinct from ordinary venous dilation alone.
- Macular edema
Retinal thickening or fluid accumulation involving the macular region, assessed using anatomical and functional evidence rather than exudates alone.
- Retinoblastoma
A pediatric retinal malignancy associated with RB1-related tumor-suppressor dysfunction, requiring specialist clinical, genetic and family assessment.
- Aqueous outflow
Drainage of aqueous humor through conventional and unconventional pathways whose resistance relationships influence intraocular pressure.
- Gonioscopy
Examination of the anterior chamber angle using an appropriate optical method to overcome the ordinary viewing limitation and identify relevant structures.
- Afferent pupillary defect
An asymmetry of the pupillary response supporting asymmetric afferent pathway function, interpreted with the examination and clinical differential.
- Incomitance
Variation of an ocular deviation with direction of gaze, relevant when distinguishing paresis, restriction and other alignment mechanisms.
- Amblyopia
Reduced vision related to abnormal visual development after appropriate assessment for refractive, strabismic, deprivation and organic explanations.
- Proptosis
Forward displacement of the globe requiring assessment of orbital cause, visual function, motility and the clinical time course.
- Masquerade syndrome
A process that resembles ocular inflammation but has another underlying explanation, considered when the course or response is atypical.