Certified Ophthalmic Technician COT- Exam
2026-2027 Study Guide Questions And Answers
Endophthalmitis
Ocular emergency following cataract surgery when a patient presents with
symptoms of a painful red eye and decreased vision within the first week
Trabeculectomy
Glaucoma surgery that permits aqueous to filter out of the anterior chamber and
form a conjunctival bleb
Enucleation
Total removal of the eye globe
Evisceration
Removal of the contents of the eye, leaving the outer shell with the muscles
attached
Physiologic Blind Spot
15 degrees Temporal to Fixation
,1,000 Apostilbs or 1430 Lumens
Light meter readings for calibrating a Goldmann perimeter
Red Color Stimulus
Used on an automated perimeter test for detecting macular defects
Blue Color Stimulus on Yellow Background
Used for earlier detection of visual field loss
Amsler Grid Visual Field
Central 20 degrees (or 10 degrees from fixation)
Tubular/Spiral Visual Field Defects
Indicated in hysterical patients
Binocular Visual Field
Extends 120 degrees
, Bitemporal Hemianopsia (optic chiasm)
A lesion at the optic chiasm, may involve only fibers crossing over to the opposite
side. Since these fibers originate in the nasal half of each retina, visual loss
involves the temporal half of each field. May be caused by a tumor.
Bjerrum's (arcuate) Scotoma
Complete nerve fiber bundle defect emanating from the blind spot, arching over or
under the macula and ending on the nasal horizontal line
Gram & Geimsa Staining
Dye procedures used to detect and classify bacteria
Staphylococcus Aureus
Gram positive bacterium that frequently causes blepharitis, conjunctivitis, and
infectious keratitis
Psuedomonas Aeruginosa
Gram-negative organism associated with contact lens overwear
Herpes Simplex Virus Type 1
transient viral vesicles that infect the facial area
2026-2027 Study Guide Questions And Answers
Endophthalmitis
Ocular emergency following cataract surgery when a patient presents with
symptoms of a painful red eye and decreased vision within the first week
Trabeculectomy
Glaucoma surgery that permits aqueous to filter out of the anterior chamber and
form a conjunctival bleb
Enucleation
Total removal of the eye globe
Evisceration
Removal of the contents of the eye, leaving the outer shell with the muscles
attached
Physiologic Blind Spot
15 degrees Temporal to Fixation
,1,000 Apostilbs or 1430 Lumens
Light meter readings for calibrating a Goldmann perimeter
Red Color Stimulus
Used on an automated perimeter test for detecting macular defects
Blue Color Stimulus on Yellow Background
Used for earlier detection of visual field loss
Amsler Grid Visual Field
Central 20 degrees (or 10 degrees from fixation)
Tubular/Spiral Visual Field Defects
Indicated in hysterical patients
Binocular Visual Field
Extends 120 degrees
, Bitemporal Hemianopsia (optic chiasm)
A lesion at the optic chiasm, may involve only fibers crossing over to the opposite
side. Since these fibers originate in the nasal half of each retina, visual loss
involves the temporal half of each field. May be caused by a tumor.
Bjerrum's (arcuate) Scotoma
Complete nerve fiber bundle defect emanating from the blind spot, arching over or
under the macula and ending on the nasal horizontal line
Gram & Geimsa Staining
Dye procedures used to detect and classify bacteria
Staphylococcus Aureus
Gram positive bacterium that frequently causes blepharitis, conjunctivitis, and
infectious keratitis
Psuedomonas Aeruginosa
Gram-negative organism associated with contact lens overwear
Herpes Simplex Virus Type 1
transient viral vesicles that infect the facial area
