Page 1 of 267
NBEO PART 1 EXAM 2026/2027 BANK
COMPLETE CURRENT TESTING QUESTION AND
DETAILED CORRECT ANSWER (VERIFIED)
GUARANTEED PASS/TOP-RATED A+.
NBEO
Ace your preparation for the NBEO Part 1 Exam by mastering
foundational topics such as applied basic sciences, anatomy,
physiology, optics, biochemistry, and visual science principles.
This exam evaluates your understanding of the scientific
knowledge required for clinical optometry practice. It is
designed for optometry students progressing toward licensure
as Doctors of Optometry.
Which of the following organisms can penetrate an INTACT
cornea?
Salmonella enterica
Haemophilus influenza
Staphylococcus aureus
Staphylococcus epidermis ...... ANSWER ....... There is
currently much debate in the literature regarding
Pseudomonas because it was previously believed that
Pseudomonas aeruginosa was capable of penetrating an
, Page 2 of 267
intact cornea by secreting proteolytic enzymes that could
break down the corneal barrier. However, current
research suggests that this line of thinking no longer
holds true. At present, it is believed that N. gonorrhoeae,
Corynebacterium diphtheriae, Listeria species, and
Haemophilus species are capable of infecting an intact
cornea. Treatment commonly involves topical antibiotic
ophthalmic drops. ✓ ✓
Staphylococcus aureus, S. Epidermis, and Salmonella
cannot penetrate an intact epithelium.
References:
Clinical Applications of the Limulus Amoebocyte Lysate
Test. Prior, R. CRC Press, 1990 page 122.
Clinical Infectious Disease.Schlossberg, D. Cambridge
Medicine, 2008, page 87
Cornea and External Eye Disease. Reinhard, T. et al.
Springer, 2008, page 22.
Haemophilus: Advances in Research and Treatment: 2011
Edition: Scholarly Paper.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2715680/
, Page 3 of 267
What is the vergence demand using a Variable Tranaglyph
when the separation is measured as 4 cm at a distance of 80
cm when training divergence?
20 prism diopters base-in
20 prism diopters base-out
5 prism diopters base-in
5 prism diopters base-out ...... ANSWER ....... The
equation to calculate vergence demand is:
demand = target separation in centimeters/training
distance in meters
demand = 4 cm/0.80 m
demand = 5 prism diopters ✓ ✓
Because divergence is being trained in the above patient, the
demand will be base-in. If convergence was being trained,
the demand would be base-out.
When analyzing a gas-permeable lens, you measure base
curves of 7.58 and 7.84 with a radiuscope, and -1.00 and -
, Page 4 of 267
2.50 on lensometry. What type of toric gas-permeable
contact lens design do you have?
Thin-flex
Front surface (F1) toric
Cylinder power effect (CPE) bitoric
Spherical power effect (SPE) bitoric
Back surface (base curve) toric ...... ANSWER ....... In
order to determine which design of toric gas-permeable
contact lens you have once the lens has been analyzed,
the difference in base curve (BC) values and contact lens
power (CLP) readings must be calculated first. ✓ ✓
BC1 = 7.58 = 337.5/7.58 = 44.50
BC2 = 7.84 = 337.5/7.84 = 43.00
Change in BC = 1.50 D
CLP1 = -1.00
CLP2 = -2.50
Change in CLP = 1.50 D
NBEO PART 1 EXAM 2026/2027 BANK
COMPLETE CURRENT TESTING QUESTION AND
DETAILED CORRECT ANSWER (VERIFIED)
GUARANTEED PASS/TOP-RATED A+.
NBEO
Ace your preparation for the NBEO Part 1 Exam by mastering
foundational topics such as applied basic sciences, anatomy,
physiology, optics, biochemistry, and visual science principles.
This exam evaluates your understanding of the scientific
knowledge required for clinical optometry practice. It is
designed for optometry students progressing toward licensure
as Doctors of Optometry.
Which of the following organisms can penetrate an INTACT
cornea?
Salmonella enterica
Haemophilus influenza
Staphylococcus aureus
Staphylococcus epidermis ...... ANSWER ....... There is
currently much debate in the literature regarding
Pseudomonas because it was previously believed that
Pseudomonas aeruginosa was capable of penetrating an
, Page 2 of 267
intact cornea by secreting proteolytic enzymes that could
break down the corneal barrier. However, current
research suggests that this line of thinking no longer
holds true. At present, it is believed that N. gonorrhoeae,
Corynebacterium diphtheriae, Listeria species, and
Haemophilus species are capable of infecting an intact
cornea. Treatment commonly involves topical antibiotic
ophthalmic drops. ✓ ✓
Staphylococcus aureus, S. Epidermis, and Salmonella
cannot penetrate an intact epithelium.
References:
Clinical Applications of the Limulus Amoebocyte Lysate
Test. Prior, R. CRC Press, 1990 page 122.
Clinical Infectious Disease.Schlossberg, D. Cambridge
Medicine, 2008, page 87
Cornea and External Eye Disease. Reinhard, T. et al.
Springer, 2008, page 22.
Haemophilus: Advances in Research and Treatment: 2011
Edition: Scholarly Paper.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2715680/
, Page 3 of 267
What is the vergence demand using a Variable Tranaglyph
when the separation is measured as 4 cm at a distance of 80
cm when training divergence?
20 prism diopters base-in
20 prism diopters base-out
5 prism diopters base-in
5 prism diopters base-out ...... ANSWER ....... The
equation to calculate vergence demand is:
demand = target separation in centimeters/training
distance in meters
demand = 4 cm/0.80 m
demand = 5 prism diopters ✓ ✓
Because divergence is being trained in the above patient, the
demand will be base-in. If convergence was being trained,
the demand would be base-out.
When analyzing a gas-permeable lens, you measure base
curves of 7.58 and 7.84 with a radiuscope, and -1.00 and -
, Page 4 of 267
2.50 on lensometry. What type of toric gas-permeable
contact lens design do you have?
Thin-flex
Front surface (F1) toric
Cylinder power effect (CPE) bitoric
Spherical power effect (SPE) bitoric
Back surface (base curve) toric ...... ANSWER ....... In
order to determine which design of toric gas-permeable
contact lens you have once the lens has been analyzed,
the difference in base curve (BC) values and contact lens
power (CLP) readings must be calculated first. ✓ ✓
BC1 = 7.58 = 337.5/7.58 = 44.50
BC2 = 7.84 = 337.5/7.84 = 43.00
Change in BC = 1.50 D
CLP1 = -1.00
CLP2 = -2.50
Change in CLP = 1.50 D
